Renesas RL78 Series Installation and operating instructions

APPLICATION NOTE
R01AN2669EG0100 Rev.1.00 Page
1
of 24
Mar 20, 2015
RL78, RX Family
PmodTM Application Board
Battery Charging, Sensor and Pmod Sample Code
Introduction
The PmodTM Application board is an auxiliary PCB designed to connect to Renesas Starter Kit (RSK) boards using their
application headers. It provides additional features not necessarily found on the RSK board, such as 4 Pmod™interfaces,
battery-charge control for USB applications, a temperature sensor, LEDs, buzzer and some extra switches. Further
functionality can be provided from sensor peripherals which are not fitted as standard. These are a digital accelerometer
and both an analogue and digital gyroscope.
This application note describes the technical details of the sample code designed to demonstrate how to use the PmodTM
Application Board peripherals with the RSK. Each sample has been targeted at a specific RSK to which the PmodTM
Application Board connects. The target device for each sample is shown in the table below.
Sample Code
Target Platform
Battery Charging
RSKRL78G1C
Accelerometer Sensor
RSKRX111
Analogue Gyroscope Sensor
RSKRX111
Digital Gyroscope Sensor
RSKRX111
Temperature Sensor
RSKRX111
Pmod™Display
RSKRX111
Please refer to the PmodTM Application Board User’s Manual for compatibility with other RSK’s.
The following documents apply to the PmodTM Application board. Make sure to refer to the latest versions of these
documents. The newest versions of the documents listed are available from the Renesas Electronics Web site.
Document Type
Description
Document Title
Document No.
User’s Manual
Describes the technical details of the RSK
hardware.
Pmod™
Application Board
User’s Manual
R20UT3112EG0100
Quick Start Guide
Provides simple instructions to setup the
RSK and run the first sample.
Pmod™
Application Board
Quick Start Guide
R20UT3113EG0100
Schematics
Full detail circuit schematics of the RSK.
Pmod™
Application Board
Schematics
R20UT3111EG0100
Application Note
Pmod™Application Board –Sensors,
Pmod™and Battery charging Application
Note
Pmod™
Application Board
Application Note
R01AN2669EG0100
R01AN2669EG0100
Rev.1.00
Mar 20, 2015

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Contents
1. Overview.........................................................................................................................4
1.1 Equipment Required...................................................................................................................4
2. Application Leading Tool (Applilet) ..............................................................................5
3. Hardware Setup..............................................................................................................6
3.1 RSKRL78G1C Configuration......................................................................................................6
3.2 RSKRX111 Configuration...........................................................................................................7
3.3 PmodTM Application Board.........................................................................................................8
4. Battery Charging Sample...............................................................................................9
4.1Host Mode....................................................................................................................................9
4.1.2 Configuration...........................................................................................................................9
4.2 Peripheral Mode ........................................................................................................................10
4.2.1 Configuration.........................................................................................................................10
4.3 Running Battery Charging Sample .........................................................................................10
4.4 User Interface ............................................................................................................................11
4.4.1 Battery Status........................................................................................................................12
4.4.2 Temperature Detection .........................................................................................................12
4.4.3 USB Detection.......................................................................................................................12
4.4.4 Charging Mode......................................................................................................................12
4.4.5 Charging Voltage ..................................................................................................................12
4.4.6 Charging Current...................................................................................................................12
4.4.7 Board Configuration..............................................................................................................12
4.5 Sample Code Information.........................................................................................................13
4.5.1 RSKRL78G1C Interface........................................................................................................13
4.6Operation ...................................................................................................................................13
5. Sensor Samples ...........................................................................................................14
5.1 Accelerometer Sensor..............................................................................................................14
5.1.1Connections..........................................................................................................................14
5.1.2 RSK RX111 Interface............................................................................................................14
5.1.3 Operation ..............................................................................................................................14
5.2 Analogue Gyroscope Sensor...................................................................................................15
5.2.1 Connections..........................................................................................................................15
5.2.2 RSKRX111 Interface.............................................................................................................15
5.2.3 Operation ..............................................................................................................................16
5.3 Digital Gyroscope Sensor ........................................................................................................17
5.3.1 Connections..........................................................................................................................17
5.3.2 RSKRX111 Interface.............................................................................................................17
5.3.3 Operation ..............................................................................................................................17

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5.4 Temperature Sensor .................................................................................................................18
5.4.1 Connections..........................................................................................................................18
5.4.2 RSKRX111 Interface.............................................................................................................18
5.4.3 Operation ..............................................................................................................................18
6. Pmod Display sample ..................................................................................................19
6.1.1 Connections..........................................................................................................................19
6.1.2 RSKRX111 Interface.............................................................................................................20
6.1.3 Operation ..............................................................................................................................20

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1. Overview
This applications note aims to provide the user with information that describes each embedded firmware sample for the
Pmod Application Board. Its aim is to describe the operation of the sample code for the various peripherals, to aid in the
understanding of how to operate such peripherals with the Renesas microcontrollers on the RSK boards.
1.1 Equipment Required
Listed below is the equipment required to run all the sample code.
The Pmod Application board
RSKRX111 Test board with default option links and then configured as in section Figure 3-2.
RSKRL78G1C Test board with default option links and then configured as in section Figure 3-1.
Pmod LCD Module.
E1 Emulator.
E1 USB cable.
Regulated Power Supply Unit (PSU). Can be used for supplying 5.0V @ 500mA to the RSK.
A PC running windows 8/7 with e2 studio version 3.1.0.24
(Available via web download at http://www.renesas.com/e2studio_download)
USB type A to mini B cable.
Option Links: 0Ω resistor RC0603JR-070RL.
Accelerometer IC: ADXL345BCCZ.
Analogue Gyroscope : ADXRS652BBGZ.
Digital Gyroscope: ADXRS450BRGZ.
Amplifier : MCP6401UT-E/OT.

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2. Application Leading Tool (Applilet)
Applilet for RSKL78G1C & RSKRX111 has been used to generate part of the sample code discussed in this document. Applilet is a
Windows GUI tool for generating template ‘C’ source code and project settings for the RSKRRL78G1C & RSKRX111. When using
Applilet, the engineer is able to configure various MCU features and operating parameters using intuitive GUI controls, thereby
bypassing the need in most cases to refer to sections of the Hardware Manual.
Once the engineer has configured the project, the ‘Generate Code’ function generates sample C code files for each specific MCU
feature selected. These code modules are name ‘r_cg_xxx.h’, ‘r_cg_xxx.c’, and ‘r_cg_xxx_user.c’, where ‘xxx’ is a three letter
acronym for the relevant MCU feature, for example ‘adc’. Within these code modules, the engineer is then free to add custom code
to meet their specific requirement. Custom code must be added in between the following comment delimiters:
/* Start user code for adding. Do not edit comment generated here */
/* End user code. Do not edit comment generated here */
Applilet will locate these comment delimiters, and preserve any custom code inside the delimiters on subsequent code generation
operations. This is important if after adding custom code, the engineer needs to re-visit Applilet to change any MCU operating
parameters.
Applilet is not released with this Pmod Application Board but is available via a web download at:
http://www.renesas.com/applilet_download
Note that the Applilet version for the relevant project is mentioned at the top of every code generated source file.

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C19C20C22
C21R38
R35
R14
R16 R98 R17
U3 PWR
E1
SERIAL
R43 R45
R44 R46
R36 R39 R40 R41 R42 R37
C24
R48
U5
D1
C14
C13
R99
POWER
R34
R47
R25
RES
U4
C31
R24
R94
D7
C23
R19
C30
R100
R101
JA1
R78
R83
R82
R81
R84
R86
LCD
R85
C25
R80 R79 R61 R62 R73 R74 R72 R71 R70 R69 R68 R67 R28 R23 R59 R60
R106
R105
C26
R87
C27
R88
R97
D4
USB0_D
D3
R89
R63
R64
R66
R65
R92
R91
L1
R77
R76
R26
R21
C12
C11
RV1 SW1
C10
R13
C29
U6
R95
R103
R96
R102 R104
C28
R93
D6
USB1_H
D5
L2
LED3LED2LED1LED0
C15
D2
U2
C16
R18
C17
C18
R27 R22 R50
R49
R51 R52 R53 R54 R55 R56
R57 R58
R11R10
R12
R9
C9
C8
U1
C1
C2
J8
R20
R4 R2 R1 R3
C4C5
R8 R6 C7 C6
R5 R7
X2
J1 GND
3
R90
GND
2
GND
1
R75
GND
4
R15
C3
R29 R30 R31 R32 R33
Serial Number
Product Label
X1
SW2SW3
JA2JA6
JA5
J2 J4
J3
J5
J9
J7
J6
R107
J10
3. Hardware Setup
3.1 RSKRL78G1C Configuration
The jumper settings and option links needed for the ‘Battery Charging’ sample are shown in Figure 3-1.
Figure 3-1: Illustration of option links & jumper settings needed to modify the RSKRL78G1C for the ‘Battery
Charging’ sample.
Jumper
Setting
J7
1-2
J10
2-3
Link
Setting
R51
Remove
R53
Remove
R55
Remove
R52
Fit
R54
Fit
R56
Fit

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3.2 RSKRX111 Configuration
The jumper settings and option links needed for the PmodTM Display and Sensor samples are shown in Figure 3-2.
Figure 3-2 : Illustration of option links needed to modify the RSKRX111 for the Pmod Display and Sensor samples.
Jumper
Setting
J6
n/c
J7
n/c
J8
n/c
J9
Pin2-3
J10
DNF
J11
Pin1-2
J12
Pin1-2
J13
Pin1-2
Add Link
Remove Link
R9
R8
R10
R44
R11
R46
R13
R45
R15
R111
R17
R116
R18
R122
R19
R165
R215
R193
R224
J10

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JP1
JP3
JP2
3.3 PmodTM Application Board
The jumper settings needed for the PmodTM Application Board are shown in Figure 3-3 . For option link modifications
on the PmodTM Application Board please refer to the relevant sample header in this document.
Figure 3-3: Illustration of jumper settings needed for the Pmod™Application Board.
* This board will be sold or is sold to publics as Renesas brand
Jumper
Setting
JP1
Pin1-2
JP2
Pin2-3
JP3
Pin1-2

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4. Battery Charging Sample
The ‘Battery Charging’ sample has been developed with the RSKRL78G1C platform together with the PmodTM
Application Board. It aims to demonstrate the use of the RSK and PmodTM Application Board as a USB peripheral device
(charging the battery from a Host device) or as a USB host device (when the battery is a source of power to connected
USB peripherals). This is in compliance with the USB ‘Battery Charging Specification v1.2’.
4.1 Host Mode
When configured as a Host, the RSK/PmodTM Application board can be configured to function as a Charging Downstream
Port (CDP) or a Dedicated Charging Port (DCP), as defined by the USB battery charging specification. The Pmod™
Application Board supplies regulated power from either the lithium-ion battery or the RSK power source to a USB
peripheral device via the Host USB connection on the RSK, with a current limit appropriate to the port configuration.
In Host Mode, the battery charge controller IC, R2A20056BM (IC10 on page 5 of the schematics) is used to select the
power source for supplying power to the connected peripheral device, and to limit the discharge current of the lithium-
ion battery, according to the charging mode selected. The output of the R2A20056BM is then fed to a 5V switched-mode
regulator to provide a stable supply for the USB connection.
The RSK/ PmodTM Application Board, operating as a Host can be configured to operate in the following modes:
(a) Charging Downstream Port (CDP)
A Charging Downstream Port is a USB Port in which enumerates. As such it does support data as well. It is identified
by manipulation of the data lines, as defined by the USB Battery Charging Specification. The current limit set is 1.5A.
(b) Dedicated Charging Port (DCP)
A Dedicated Charging Port is a USB port that does not enumerate. As such there is no data support. It is identified by
both USB data lines D+ and D- being connected together by a resistance not exceeding 200 Ohms. The current limit set
is 1.5A.
4.1.2 Configuration
To configure the RSK/ PmodTM Application board alterations to the source file ‘r_cg_userdefine.h’must be made. To
configure it to be a Host, Pmod_CONFIG must be defined as Pmod_HOST_MODE.
For the RSK/ PmodTM Application Board to
be configured as a CDP,
Pmod_USB_BATT_CONFIG must be
defined as Pmod_CDP_MODE.
For the RSK/ PmodTM Application Board to
be configured as a DCP,
Pmod_USB_BATT_CONFIG must be
defined as Pmod_DCP_MODE
To power the RSK/ PmodTM Application Board ensure that the Jumper J6 is fitted on pins 2-3 as well as the configuration
showed in Figure 3-1.
For safety reasons note that to only power the board from the battery after the battery_source_settings() function has been
executed.

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4.2 Peripheral Mode
In Peripheral Mode, the Pmod™Application Board provides the means to charge a connected lithium-ion battery from a
USB host via the Peripheral USB connection on the RSK. The RSK microcontroller will detect the Host charger status,
either SDP, CDP or DCP, and then communicate with the battery charge controller R2A20056BM IC10 via I2C to control
the charging current of the battery accordingly.
4.2.1 Configuration
To configure the RSK/Pmod™
Application Board, alterations to the
source file ‘r_cg_userdefine.h’must be
made. To configure it as a Peripheral
Device, the define Pmod_CONFIG must
be defined as Pmod_PERI_MODE.
4.3 Running Battery Charging Sample
Ensure that the RSKRL78G1C option links are modified from the default configuration to the configuration shown in
Figure 3-1. The default link configuration for the Pmod™Application Board is correct for the battery charging application.
Connect the PmodTM Application Board to the RSK.
1. Ensure that the jumper links on the PmodTM Application Board are as figure 4-3.
2. Open e2 studio and the USB battery charging sample project. Make the appropriate selections in
‘r_cg_userdefine.c’ in order to define Peripheral or the required Host mode. Build the code.
3. Connect the PmodTM Application Board to the RSK on the Application Headers. Connect the display to the Pmod1
connector on the PmodTM Application Board. Connect the E1 debugger to the PC with a USB cable and then to
the RSK. Connect a power supply to the RSK.
4. Run the code in debug mode.
5. For the RSK / PmodTM Application Board configured as a Peripheral, connect to the Host device using the mini-
B socket on the RSK (usually called USB0-2).
6. For the RSK / PmodTM Application Board configured as a Host, connect the peripheral to the USB-A Socket,
usually called USB0-1 on the RSK PCB.

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4.4 User Interface
In either mode, there will be certain features upon the Pmod™LCD Screen available for the user. After the user-
pressing switch 1 denoted SW1 upon the RSKRX111, the user will enter the menu. Using the variable resistor denoted
RV1 the user will be able to highlight an option in the menu. To select the option the user must press SW1, and to
escape to the menu the user must press SW2.
Figure 4-1 A flow chart to show user interface operation.
Figure 4-2 : A diagram to show the ‘Introductory Message’and ‘Menu’respectively.
Renesas
Pmod™App Board
Battery Charging
To advance
Press SW1
To exit to the main
Press SW2
Renesas Electronics
Corporation © 2014
MENU
> Battery Status
Temperature Status
USB Mode
Charging Mode
Charging Voltage
Charging Current
Current Limit
Board Config
Renesas Electronics
Corporation © 2014

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4.4.1 Battery Status
In Battery Status, the battery charge controller R2A20056BM IC10 is interrogated and the battery state summarised on
the Pmod™display. The possibilities are "Battery Not Detected", "Weak Battery", "Full Battery", "Battery Detected" or
"Good Battery". For more information upon these possibilities or on the detection method, please refer to the
R2A20056BM data sheet.
4.4.2 Temperature Detection
Temperature Detection is a feature only for batteries with a thermistor connected to them, i.e. a battery with three wires.
The battery charge controller R2A20056BM IC10 is read to determine the temperature status. The Pmod™display will
display one of the following possibilities "Temperature protection (LOW)","Low rate charge (LOW)","Normal charge",
"Low rate charge(HIGH)", "Temperature protection (HIGH)", or "No thermistor".
4.4.3 USB Detection
In this mode, the Pmod™screen will display the state of the USB. The possibilities are "PERIPHERAL-
DCP","PERIPHERAL-CDP","PERIPHERAL-SDP", "HOST-DCP" or "HOST-CDP".
4.4.4 Charging Mode
Charging Mode will again read the battery charge controller R2A20056BM IC10 and display the detected charging
state. The possibilities are "DEFAULT", "Forced Charge", "Trickle Charge", "Quick Charge", "High temp.charge-
1","High temp.charge-2", "and Charge completion detection “,” Battery non-connection, Error-1 “,” Error-2”or “Error-
3”. For more information upon these possibilities or on the detection method, please refer to the R2A20056BM data
sheet.
4.4.5 Charging Voltage
In this submenu, the user will be able to choose the voltage the battery charge controller R2A20056BM IC10 sets to
charge the battery. Pressing SW1 cycles through 4.00V, 4.05V, 4.10V, 4.15V and 4.20V.
4.4.6 Charging Current
In this submenu, the user will be able to choose the different current settings for different modes of charging; quick
charge, completion charge and trickle charge. For quick charge current, the options are 0.5c or 1.0C. For completion
current, the options are 0.05C, 0.1C or 0.2C and for trickle charge current, the options are 0.1C or 0.2C. For more
information on the current values and conditions, please refer to the R2A20056BM data sheet.
4.4.7 Current Limit
Choosing the Current Limit will allow the user to control the current limit. The options available are “100mA”,
“500mA”, “1000mA”, “1500mA”, “1800mA”, “Limitless”, “No Use ”, “SUSPEND”. The options can be achieved by
pressing switch 1 to cycle through the options.
4.4.7 Board Configuration
In board configuration, the Pmod™LCD Screen will display either ‘Host’ or ‘Peripheral’.

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4.5 Sample Code Information
4.5.1 RSKRL78G1C Interface
Table 4-1: Peripherals used for the Battery Charging Sample.
4.6 Operation
1. After initialisation, The sample application name, copyright and instructions will be displayed on the PmodTM LCD
screen.
2. In Host mode the USB power supply is configured to be derived from either the RSK power supply, or the battery,
by enabling the output of the charge controller IC10 to the 5V power supply on the PmodTM Application Board in
the enable_5V() function.
3. Depending on the defined USB port type the Host USB will be configured to either be a CDP or DCP. These port
configurations are executed in the usb_dcp_configuration() & usb_cdp_configuration() functions respectively.
4. In Peripheral mode the port type connected to the function USB port on the RSKRL78G1C is detected, in the
usb_port_detection() function.
5. Following this the function user_interface() is entered.
6. The sample will then wait for switch 1 on the RSKRL78G1C to be pressed, before entering the main loop.
7. Following this the user interface is set up in an infinite while loop to handle the menu features. A menu is displayed
and a selection adjusted using the pot on the RSK, in the function main_menu_selector() (along with the display
update). Pressing SW1 on the RSK makes the selection, and the appropriate function is called from the
submenu_display() function.
8. The submenu includes 8 functions:
i. battery_detection_state() - Achieved by reading register 0x03 of the battery-charging IC and will
display according to the data received.
ii. temperature_detection() - Achieved by reading the TEMP bits of register 0x04 of the battery
charging IC and display accordingly.
iii. usb_state() - In Host mode, this is a consequence of the defined operation of the Battery Charging
Sample. In Peripheral mode the display shows the connected USB Host type, the stored result from
the function mentioned in step 4.
iv. charging_mode() - Achieved by reading the USB bits of register 0x04 of the battery charging IC
and displaying the result.
v. charging_voltage() - In this subheading the sample allows the user with an interrupt driven switch
to select and see the charging by reading and writing to the VCHG bits of register 0x00.
vi. charging_current() –Similar to Charging Voltage switch 1 is used to change current values as
described in 5.4.6 . This is accomplished by reading and writing to the 0x00 address of the battery-
charging chip.
vii. board_configuration() –This is displayed as a consequence of the defined operation.
viii. error() –Uses the SPI protocol to display “Error”.
9. The sample then waits until SW2 is pressed and repeats the loop from step 6.
Task
Module
MCU Pins Used
Application Header
Pins Used
Function
Interfacing with IC10
R2A20056BM
Charge Controller IC
MCU - IIC
SCLA0-P60
SDAA0-P61
JA1 –25
JA1 –26
Communicating with
IC10 R2A20056BM
battery charge controller.
Interfacing with
Pmod™Screen
MCU –SCI0
MCU –I/O
MCU –IIC
SO00TX –P51
SCLK00 –P30
P21 –(Pmod1 SS)
P23 –(Pmod1 PIN9)
SCLA0-P60
SDAA0-P61
JA2 –6
JA2 –10
JA1 –10
JA1 –12
JA1 –25
JA1 –26
Data Transfer on Pmod
channel 1
Driving Port Expander
IC14 for Pmod RST and
PIN10 lines
USB power supply /
charging
EXT_CHG
EXT_BATT
EXT_VBUS
N/A
N/A
N/A
JA6 –21
JA6 –19
JA6 –17
- Function Battery
Charge Supply
- Host supply from
battery to RSK
- Host supply to USB

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5. Sensor Samples
The sensor samples have been developed on the RSKRX111 platform connected to the PmodTM Application Board.
5.1 Accelerometer Sensor
The aim of this sample is to use the accelerometer to display acceleration in the 3 X, Y and Z planes.
The PmodTM Application Board is not fitted with an accelerometer as default. An Analog Devices ADXL345 IC must
be mounted on the PmodTM Application Board in order for the sample code to work, fitted in position IC2.
The sample reads the relevant registers from the ADXL345 via the IIC bus connection and outputs the raw data for the
X, Y and Z axes raw data to the display.
5.1.1 Connections
The accelerometer is to be soldered at position IC2 of the PmodTM Application Board.
The RSKRX111 must be configured as detailed in Figure 3-2, for the Accelerometer Sensor Sample to work correctly.
Connect the PmodTM Application Board to the RSKRX111 on the Application Headers.
Ensure the Pmod™LCD display is attached to the Pmod1 Connector before power up.
5.1.2 RSK RX111 Interface
Table 5-1:Peripherals used for the ‘Accelerometer Sensor’ Sample.
5.1.3 Operation
1. The sample first initialises Pmod™ display on PmodTM channel 1. The IIC MCU peripheral is set as a master
to configure the port expander IC14 controlling the reset and pin10 lines for Pmod1 as well as the
accelerometer. To communicate with the Pmod™display, the SCI1 MCU peripheral is configured as ‘Simple
SPI bus’ (Master transmit only).
2. It then uses the SPI protocol to display the name of the sample & copyright information.
3. The sample then loops repeatedly, reading the accelerometer device id for validation purposes then reading the
acceleration values for the X, Y and Z axes.
4. Then it displays the results, unscaled onto the display connected to Pmod1.
Task
Module
MCU Pins Used
Application Header
Pins Used
Function
Communicating with
IC2 ADXL345
accelerometer
MCU - IIC
SCL-PB0
SDA-PA6
JA1 –26
JA1 –25
Communicating with
IC2 ADXL345
accelerometer
Interfacing with
Pmod™Screen
MCU –SCI0
MCU –I/O
MCU –IIC
TXD1 –P16
SCK1 –P17
P41 –(Pmod1 SS)
P43 –(Pmod1 PIN9)
SCL-PB0
SDA-PA6
JA2 –6
JA2 –10
JA1 –10
JA1 –12
JA1 –26
JA1 –25
Data Transfer on Pmod
channel 1
Driving Port Expander
IC14 for Pmod RST and
PIN10 lines

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5.2 Analogue Gyroscope Sensor
The aim for this sample is to use the analogue gyroscope to display the z-axis (yaw) angular rate of the PmodTM
Application Board.
The PmodTM Application Board is not fitted with an Analogue Gyroscope or an associated Operational Amplifier by
default. An Analogue Devices ADXRS652 IC and a Microchip MCP6401U must be mounted on the PmodTM
Application Board in order for this sample to operate correctly, in positions IC4 and IC5 respectively.
The sample demonstrates the use of the Analogue Gyroscope, reading the output with the ADC and displaying the
angular rate to the Pmod™Screen.
5.2.1 Connections
The analogue gyroscope IC ADXRS652 and op-amp IC MCP6401U must be fitted in position IC4 and IC5 on the PmodTM
Application Board respectively. Resistor 0Ω link R47 must be fitted and R35 must be removed. The locations are shown
in Figure 5-1. This modification is required to route the analogue signal from the gyroscope (signal AGYRO) to the
correct ADC port on the RSKRX111 (AN014).
Figure 5-1: PmodTM Application Board Link Configuration for Analogue Gyroscope Sample
The RSKRX111 must be configured as detailed in Figure 3-2 for the Analogue Gyroscope Sensor Sample to work
correctly.
Connect the Pmod™Application Board to the RSKRX111 on the Application Headers.
Ensure the Pmod™LCD display is attached to the Pmod1 Connector before power up.
5.2.2 RSKRX111 Interface
Table 5-2:Connections and MCU Peripherals used for the Analogue Gyroscope Sensor Sample.
Fit 0Ω Link
Remove Link
R47
R35
Task
Module
MCU Pins Used
Application Header
Pins Used
Function
Gyroscope output
(after MCP6401U op-
amp buffer)
MCU - ADC
AN014 –PE6
JA5 –3 (ADC6)
Analogue output of
gyroscope
Interfacing with
Pmod™Screen
MCU –SCI0
MCU –I/O
MCU –IIC
TXD1 –P16
SCK1 –P17
P41 –(Pmod1 SS)
P43 –(Pmod1 PIN9)
SCL-PB0
SDA-PA6
JA2 –6
JA2 –10
JA1 –10
JA1 –12
JA1 –26
JA1 –25
Data Transfer on Pmod
channel 1
Control of port expander
IC14 for Pmod RST &
PIN10 lines

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5.2.3 Operation
1. The sample first initialises the display on Pmod1. In initiating the display, the IIC MCU peripheral is
configured in I2C Mode (Master) to drive port expander IC14 that controls the RST and PIN10 lines of the
PmodTM interface. To communicate with the display, the SCI MCU peripheral is configured as ‘Simple SPI
bus’ (Master transmit only).
2. The sample then sets the ADC MCU peripheral to operate in single-scan mode to read the analogue
gyroscope’s amplified output.
3. The sample then displays the name of the sample, instructions and copyright information.
4. The sample then enters an infinite while loop, first reading channel 14 of the ADC and waiting for the ADC
conversion to complete.
5. It then converts the unsigned 12-bit ADC reading from the gyroscope to a string for it to be displayed on the
display.

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5.3 Digital Gyroscope Sensor
The aim for this sample is to use the digital gyroscope to display the z-axis (yaw) angular rate of the PmodTM
Application Board.
As supplied the PmodTM Application Board is not fitted with a digital gyroscope. An Analogue Devices ADXRS450 IC
will be needed to be sourced separately and soldered to the PmodTM Application Board, in position IC3.
The sample demonstrates communication with the digital gyroscope, reading the output and displaying the acquired
‘RTE’ registers on the Pmod™LCD display.
5.3.1 Connections
The RSKRX111 must be modified as detailed in Figure 3-2. The Digital Gyroscope IC ADXRS450 must be fitted at
position IC3 of the PmodTM Application Board. Resistor 0Ω link R46 must be fitted and R67 must be removed. The
locations are shown in Figure 5-2. This modification is required to route the chip select line for the Gyroscope SPI
communications but to the correct port on the RX111.
Figure 5-2: PmodTM Application Board Link Configuration for Digital Gyroscope Sample
The Pmod™LCD display should be connected to the Pmod1 Connector before power up.
5.3.2 RSKRX111 Interface
Table 5-3:Connections and MCU Peripherals used for the Digital Gyroscope Sensor Sample.
* Note that this is not reproducible by Applilet as it uses a non-applilet function.
5.3.3 Operation
1. The sample first initialises the display on Pmod1. In initiating the display, the IIC MCU peripheral is
configured in I2C Mode (Master) to configure port expander IC14 to control the RST and PIN10 lines to
Pmod1. For data transfer to the Pmod™display, and to/from the gyroscope the SCI MCU peripheral is
configured as ‘Simple SPI bus’ (Master transmit/receive).
2. The Digital gyroscope is then checked for errors by sending an initialisation sequence, as described in the
gyroscope datasheet.
3. The sample then displays the name of the sample and copyright information on display.
4. The sample then enters an infinite while loop, reading yaw rate information found in the ‘RTE’ registers of the
Gyroscope. The result is then scaled and converted to a decimal number, and output to the display. There is
then a 100ms delay before the cycle repeats.
Fit 0Ω Link
Remove Link
R46
R67
Task
Module
MCU Pins Used
Application Header
Pins Used
Function
Gyroscope
Communications
MCU –SCI1*
MCU –I/O
TXD1 –P16
SCK1 –P17
PE7 –(DGYRO_SS)
JA2 –6
JA2 –10
JA5 –4
Communication with
Digital Gyroscope via
SCI in SPI mode.
Interfacing with
Pmod™Display
MCU –SCI1
MCU –I/O
MCU –IIC
TXD1 –P16
SCK1 –P17
P41 –(Pmod1 SS)
P43 –(Pmod1 PIN9)
SCL-PB0
SDA-PA6
JA2 –6
JA2 –10
JA1 –10
JA1 –12
JA1 –26
JA1 –25
Data Transfer on Pmod
channel 1
Control of port expander
IC14 for Pmod RST &
PIN10 lines

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5.4 Temperature Sensor
The aim for this sample is to use the temperature sensor to display the temperature on a display connected to Pmod1.
The Pmod™Application Board is fitted with a Microchip MCP9700AT Temperature Sensor by default.
The sample will demonstrate reading the output of the temperature sensor IC and displaying the temperature in degree
Celsius on the display.
5.4.1 Connections
The temperature sensor is fitted in position IC1 of the PmodTM Application Board.
Please ensure the Pmod™LCD Screen is placed in the Pmod1 Connector before power up.
5.4.2 RSKRX111 Interface
Table 5-4:Connections and MCU Peripherals used for the Temperature Sensor Sample.
5.4.3 Operation
1. The sample first initialises PmodTM display and the MCU 12-bit Analogue to Digital converter in single shot mode.
In initiating the display, the IIC MCU peripheral is configured in Master Mode to configure port expander IC14,
which controls the RST and PIN10 lines of the Pmod™ connector. The SCI MCU peripheral is configured as a
‘Simple SPI bus’ (Master transmit only) for the data transfer to the display.
2. The sample then displays the name of the sample & copyright information on the Pmod™ display.
3. The sample then enters an infinite while loop and reads channel AN002 of the ADC, then waiting for the ADC
conversion to complete.
4. Then the sample converts the 12 bit ADC reading into Degree Celsius scale.
5. It then converts this result to an ASCII string for it to be displayed on Pmod1.
Task
Module
MCU Pins Used
Application Header
Pins Used
Function
Temperature sensor
MCU –ADC
AN002 –P42
JA1 –11
Analogue output from
temperature sensor
Interfacing with
Pmod™Display
MCU –SCI1
MCU –I/O
MCU –IIC
TXD1 –P16
SCK1 –P17
P41 –(Pmod1 SS)
P43 –(Pmod1 PIN9)
SCL-PB0
SDA-PA6
JA2 –6
JA2 –10
JA1 –10
JA1 –12
JA1 –26
JA1 –25
Data Transfer on Pmod
channel 1
Control of port expander
IC14 for Pmod RST &
PIN10 lines

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6. Pmod Display sample
The aim of this sample is to demonstrate the display of text and pictures on a display connected to any of the PmodTM
connectors Pmod1 –Pmod4.
6.1.1 Connections
The RSKRX111 must initially be modified as detailed in Figure 3-2. Further required modifications are detailed in
Table 6-1. The locations are shown in
Figure 6-1: PmodTM Application Board Link Configuration for Pmod Connectors
.
Table 6-1 : RSKRX111 PmodTM Channel Resistor Configuration
Figure 6-1: PmodTM Application Board Link Configuration for Pmod Connectors
The desired PmodTM connector for the display can be selected in software in the source file ‘r_cg_userdefine.c’. The
default is Pmod1.
Ensure the Pmod™LCD display is placed in the selected Pmod connector before power up.
Channel
Fit 0Ω Link
Remove
Signal
Pmod1
Default configuration as per Figure 3-2 works without modification
Pmod2
R19
R209
Pmod2_SS
Pmod3
R18
R111
Pmod3_PIN9
R17
R122
Pmod3_SS
Pmod4
R15
R203
Pmod4_SS
R13
R8
Pmod4_PIN9
Add Link
Remove Link
R19
R209
R18
R111
R17
R122
R15
R203
R13
R8

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6.1.2 RSKRX111 Interface
Table 6-2: Peripherals used for the ‘PmodDisplay’sample.
6.1.3 Operation
1. The sample will initiate the PmodTM channel as defined in the ‘r_cg_userdefine.h’file and the RTC with counting
mode being set to Calendar Mode. In initiating the display, the IIC MCU peripheral is configured in Master Mode to
configure port expander IC14, which controls the RST and PIN10 lines of the Pmod™ connector. The SCI MCU
peripheral is configured as a ‘Simple SPI bus’ (Master transmit only) for the data transfer to the display.
2. Following this the PmodTM will display the sample and copyright information.
3. The sample then waits until the interrupt driven switch (SWA) is pressed in the swa_press() function.
4. The sample then initialises the RTC and enters the main loop.
5. In the RTC interrupt the RTC time is read and stored in array as well as setting a variable to three states depending
on the number of times the interrupt has been called. The variable is processed in the main loop (mentioned in step
4) to either display a picture, text or clear the screen.
6. The Pmod™will also display the time since the RTC was initiated.
Task
Module
MCU Pins Used
Application Header
Pins Used
Function
Interfacing with
Pmod™Display on
Pmod1
MCU –SCI1
MCU –I/O
MCU –IIC
TXD1 –P16
SCK1 –P17
P41 –(Pmod1 SS)
P43 –(Pmod1 PIN9)
SCL-PB0
SDA-PA6
JA2 –6
JA2 –10
JA1 –10
JA1 –12
JA1 –26
JA1 –25
Data Transfer on Pmod
channel 1
Control of port expander
IC14 for Pmod RST &
PIN10 lines
Interfacing with
Pmod™Display on
Pmod2
MCU –SCI1
MCU –I/O
MCU –IIC
TXD1 –P16
SCK1 –P17
PE0 –(Pmod2 SS)
PB5 –(Pmod2 PIN9)
SCL-PB0
SDA-PA6
JA2 –6
JA2 –10
JA1 –15
JA2 –21
JA1 –26
JA1 –25
Data Transfer on Pmod
channel 2
Control of port expander
IC14 for Pmod RST &
PIN10 lines
Interfacing with
Pmod™Display on
Pmod3
MCU –SCI1
MCU –I/O
MCU –IIC
TXD1 –P16
SCK1 –P17
PE2 –(Pmod3 SS)
PE1 –(Pmod3 PIN9)
SCL-PB0
SDA-PA6
JA2 –6
JA2 –10
JA1 –17
JA1 –16
JA1 –26
JA1 –25
Data Transfer on Pmod
channel 3
Control of port expander
IC14 for Pmod RST &
PIN10 lines
Interfacing with
Pmod™Display on
Pmod4
MCU –SCI1
MCU –I/O
MCU –IIC
TXD1 –P16
SCK1 –P17
PE4 –(Pmod4 SS)
PE6 –(Pmod4 PIN9)
SCL-PB0
SDA-PA6
JA2 –6
JA2 –10
JA1 –19
JA1 –21
JA1 –26
JA1 –25
Data Transfer on Pmod
channel 4
Control of port expander
IC14 for Pmod RST &
PIN10 lines