Renesas RL78 Series User manual

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All information contained in these materials, including products and product specifications, represents
information on the product at the time of publication and is subject to change by Renesas Electronics
Corporation without notice. Please review the latest information published by Renesas Electronics
Corporation through various means, including the Renesas Electronics Corporation website
(http://www.renesas.com).
RL78/L1C Group
Renesas Starter Kit User’s Manual
For CubeSuite+
Rev. 1.02 Apr 2014
32
RENESAS MCU
RL78
Family / L1X Series
16
User’s Manual

Notice
1. Descriptions of circuits, software and other related information in this document are provided only to illustrate the operation of
semiconductor products and application examples. You are fully responsible for the incorporation of these circuits, software,
and information in the design of your equipment. Renesas Electronics assumes no responsibility for any losses incurred by you
or third parties arising from the use of these circuits, software, or information.
2. Renesas Electronics has used reasonable care in preparing the information included in this document, but Renesas Electronics
does not warrant that such information is error free. Renesas Electronics assumes no liability whatsoever for any damages
incurred by you resulting from errors in or omissions from the information included herein.
3. Renesas Electronics does not assume any liability for infringement of patents, copyrights, or other intellectual property rights of
third parties by or arising from the use of Renesas Electronics products or technical information described in this document. No
license, express, implied or otherwise, is granted hereby under any patents, copyrights or other intellectual property rights of
Renesas Electronics or others.
4. You should not alter, modify, copy, or otherwise misappropriate any Renesas Electronics product, whether in whole or in part.
Renesas Electronics assumes no responsibility for any losses incurred by you or third parties arising from such alteration,
modification, copy or otherwise misappropriation of Renesas Electronics product.
5. Renesas Electronics products are classified according to the following two quality grades: “Standard” and “High Quality”. The
recommended applications for each Renesas Electronics product depends on the product’s quality grade, as indicated below.
“Standard”: Computers; office equipment; communications equipment; test and measurement equipment; audio and visual
equipment; home electronic appliances; machine tools; personal electronic equipment; and industrial robots etc.
“High Quality”: Transportation equipment (automobiles, trains, ships, etc.); traffic control systems; anti-disaster systems; anti-
crime systems; and safety equipment etc.
Renesas Electronics products are neither intended nor authorized for use in products or systems that may pose a direct threat to
human life or bodily injury (artificial life support devices or systems, surgical implantations etc.), or may cause serious property
damages (nuclear reactor control systems, military equipment etc.). You must check the quality grade of each Renesas
Electronics product before using it in a particular application. You may not use any Renesas Electronics product for any
application for which it is not intended. Renesas Electronics shall not be in any way liable for any damages or losses incurred
by you or third parties arising from the use of any Renesas Electronics product for which the product is not intended by Renesas
Electronics.
6. You should use the Renesas Electronics products described in this document within the range specified by Renesas Electronics,
especially with respect to the maximum rating, operating supply voltage range, movement power voltage range, heat radiation
characteristics, installation and other product characteristics. Renesas Electronics shall have no liability for malfunctions or
damages arising out of the use of Renesas Electronics products beyond such specified ranges.
7. Although Renesas Electronics endeavors to improve the quality and reliability of its products, semiconductor products have
specific characteristics such as the occurrence of failure at a certain rate and malfunctions under certain use conditions. Further,
Renesas Electronics products are not subject to radiation resistance design. Please be sure to implement safety measures to
guard them against the possibility of physical injury, and injury or damage caused by fire in the event of the failure of a Renesas
Electronics product, such as safety design for hardware and software including but not limited to redundancy, fire control and
malfunction prevention, appropriate treatment for aging degradation or any other appropriate measures. Because the evaluation
of microcomputer software alone is very difficult, please evaluate the safety of the final products or systems manufactured by
you.
8. Please contact a Renesas Electronics sales office for details as to environmental matters such as the environmental compatibility
of each Renesas Electronics product. Please use Renesas Electronics products in compliance with all applicable laws and
regulations that regulate the inclusion or use of controlled substances, including without limitation, the EU RoHS Directive.
Renesas Electronics assumes no liability for damages or losses occurring as a result of your noncompliance with applicable laws
and regulations.
9. Renesas Electronics products and technology may not be used for or incorporated into any products or systems whose
manufacture, use, or sale is prohibited under any applicable domestic or foreign laws or regulations. You should not use
Renesas Electronics products or technology described in this document for any purpose relating to military applications or use
by the military, including but not limited to the development of weapons of mass destruction. When exporting the Renesas
Electronics products or technology described in this document, you should comply with the applicable export control laws and
regulations and follow the procedures required by such laws and regulations.
10. It is the responsibility of the buyer or distributor of Renesas Electronics products, who distributes, disposes of, or otherwise
places the product with a third party, to notify such third party in advance of the contents and conditions set forth in this
document, Renesas Electronics assumes no responsibility for any losses incurred by you or third parties as a result of
unauthorized use of Renesas Electronics products.
11. This document may not be reproduced or duplicated in any form, in whole or in part, without prior written consent of Renesas
Electronics.
12. Please contact a Renesas Electronics sales office if you have any questions regarding the information contained in this document
or Renesas Electronics products, or if you have any other inquiries.
(Note 1) “Renesas Electronics” as used in this document means Renesas Electronics Corporation and also includes its majority-
owned subsidiaries.
(Note 2) “Renesas Electronics product(s)” means any product developed or manufactured by or for Renesas Electronics.
(2012.4)

Disclaimer
By using this Renesas Starter Kit (RSK), the user accepts the following terms:
The RSK is not guaranteed to be error free, and the entire risk as to the results and performance of the RSK is
assumed by the User. The RSK is provided by Renesas on an “as is” basis without warranty of any kind whether
express or implied, including but not limited to the implied warranties of satisfactory quality, fitness for a particular
purpose, title and non-infringement of intellectual property rights with regard to the RSK. Renesas expressly
disclaims all such warranties. Renesas or its affiliates shall in no event be liable for any loss of profit, loss of data,
loss of contract, loss of business, damage to reputation or goodwill, any economic loss, any reprogramming or recall
costs (whether the foregoing losses are direct or indirect) nor shall Renesas or its affiliates be liable for any other
direct or indirect special, incidental or consequential damages arising out of or in relation to the use of this RSK, even
if Renesas or its affiliates have been advised of the possibility of such damages.
Precautions
The following precautions should be observed when operating any RSK product:
This Renesas Starter Kit is only intended for use in a laboratory environment under ambient temperature and humidity
conditions. A safe separation distance should be used between this and any sensitive equipment. Its use outside the
laboratory, classroom, study area or similar such area invalidates conformity with the protection requirements of the
Electromagnetic Compatibility Directive and could lead to prosecution.
The product generates, uses, and can radiate radio frequency energy and may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a particular installation. If this
equipment causes harmful interference to radio or television reception, which can be determined by turning the
equipment off or on, you are encouraged to try to correct the interference by one or more of the following measures;
•ensure attached cables do not lie across the equipment
•reorient the receiving antenna
•increase the distance between the equipment and the receiver
•connect the equipment into an outlet on a circuit different from that which the receiver is connected
•power down the equipment when not in use
•consult the dealer or an experienced radio/TV technician for help NOTE: It is recommended that wherever
possible shielded interface cables are used.
The product is potentially susceptible to certain EMC phenomena. To mitigate against them it is recommended that the
following measures be undertaken;
•The user is advised that mobile phones should not be used within 10m of the product when in use.
•The user is advised to take ESD precautions when handling the equipment.
The Renesas Starter Kit does not represent an ideal reference design for an end product and does not fulfil the
regulatory standards for an end product.

How to Use This Manual
1. Purpose and Target Readers
This manual is designed to provide the user with an understanding of the RSK hardware functionality, and
electrical characteristics. It is intended for users designing sample code on the RSK platform, using the many
different incorporated peripheral devices.
The manual comprises of an overview of the capabilities of the RSK product, but does not intend to be a guide
to embedded programming or hardware design. Further details regarding setting up the RSK and
development environment can found in the tutorial manual.
Particular attention should be paid to the precautionary notes when using the manual. These notes occur within the body
of the text, at the end of each section, and in the Usage Notes section.
The revision history summarizes the locations of revisions and additions. It does not list all revisions. Refer to the text of
the manual for details.
The following documents apply to the RL78/L1C Group. Make sure to refer to the latest versions of these
documents. The newest versions of the documents listed may be obtained from the Renesas Electronics Web
site.
Document Type Description Document Title Document No.
User’s Manual Describes the technical details of the RSK hardware. RSKRL78L1C
User’s Manual R20UT2203EG
Tutorial
Provides a guide to setting up RSK environment,
running sample code and debugging programs.
RSKRL78L1C
Tutorial Manual
R20UT2204EG
Quick Start Guide Provides simple instructions to setup the RSK and
run the first sample. RSKRL78L1C Quick Start Guide R20UT2205EG
Code Generator
Tutorial Provides a guide to code generation and importing
into the CubeSuite+ IDE. RSKRL78L1C Code Generator Tutorial
Manual
R20UT2887EG
Schematics Full detail circuit schematics of the RSK. RSKRL78L1C
Schematics R20UT2202EG
Hardware Manual
Provides technical details of the RL78/L1C
microcontroller.
RL78/L1C Group
Hardware Manual
R01UH0409EJ

2. List of Abbreviations and Acronyms
Abbreviation
Full Form
ADC
Analog-to-Digital Converter
E1
On-chip Debugger
ESD
Electrostatic Discharge
IIC
Philips™ Inter-Integrated Circuit Connection Bus
IRQ
Interrupt Request
EMC
Electromagnetic Compatibility
LCD
Liquid Crystal Display
LED
Light Emitting Diode
EMC
Electromagnetic Compatibility
MCU
Micro-controller Unit
n/a or NA
Not applicable
n/c or NC Not connected
PC
Personal Computer
RSK
Renesas Starter Kit
SAU
Serial Array Unit
TAU
Timer Array Unit
UART
Universal Asynchronous Receiver/Transmitter
USB
Universal Serial Bus

Table of Contents
1. Overview............................................................................................................................7
1.1 Purpose......................................................................................................................................................7
1.2 Features.....................................................................................................................................................7
2. Power Supply ....................................................................................................................8
2.1 Requirements.............................................................................................................................................8
2.2 Power-Up Behaviour..................................................................................................................................8
3. Board Layout.....................................................................................................................9
3.1 Component Layout.....................................................................................................................................9
3.2 Board Dimensions....................................................................................................................................10
3.3 Component Placement ............................................................................................................................11
4. Connectivity.....................................................................................................................12
4.1 Internal RSK Connections........................................................................................................................12
4.2 Debugger Connections............................................................................................................................13
5. User Circuitry...................................................................................................................14
5.1 Reset Circuit ............................................................................................................................................14
5.2 Clock Circuit.............................................................................................................................................14
5.3 Switches...................................................................................................................................................14
5.4 LEDs ........................................................................................................................................................15
5.5 Potentiometer...........................................................................................................................................15
5.6 LCD Panel................................................................................................................................................16
5.7 Debug LCD Module .................................................................................................................................17
5.8 RS232 Serial Port....................................................................................................................................17
5.9 Local Interconnect Network (LIN) ............................................................................................................18
5.10 USB Function...........................................................................................................................................18
6. Configuration...................................................................................................................19
6.1 Modifying the RSK ...................................................................................................................................19
6.2 RS232 Serial Port Configuration..............................................................................................................20
6.3 E1 Debugger Interface.............................................................................................................................21
6.4 LCD Panel Configuration.........................................................................................................................22
6.5 LED/Timer Pin Configuration...................................................................................................................22
6.6 IIC Pin Configuration................................................................................................................................23
6.7 Power Supply Configuration ....................................................................................................................23
6.8 Clock Circuit Configuration ......................................................................................................................24
6.9 ADC Configuration...................................................................................................................................24
6.10 LIN Configuration.....................................................................................................................................24
7. Headers...........................................................................................................................25
7.1 Application Headers.................................................................................................................................25
7.2 Microcontroller Pin Headers ....................................................................................................................29
8. Code Development..........................................................................................................31
8.1 Overview..................................................................................................................................................31
8.2 Compiler Restrictions...............................................................................................................................31
8.3 Mode Support ..........................................................................................................................................31
8.4 Debugging Support..................................................................................................................................31
8.5 Address Space.........................................................................................................................................32
9. Additional Information......................................................................................................33

RSKRL78L1C R20UT2203EG0102
Rev. 1.02
RENESAS STARTER KIT Apr 04, 2014
R20UT2203EG0102 Rev. 1.02 Page 7 of 37
Apr 04, 2014
1. Overview
1.1 Purpose
This RSK is an evaluation tool for Renesas microcontrollers. This manual describes the technical details of the
RSK hardware. The Quick Start Guide and Tutorial Manual provide details of the software installation and
debugging environment.
1.2 Features
This RSK provides an evaluation of the following features:
•Renesas microcontroller programming
•User code debugging
•User circuitry such as switches, LEDs and a potentiometer
•Sample application
•Sample peripheral device initialisation code
The RSK board contains all the circuitry required for microcontroller operation.

RSKRL78L1C 2. Power Supply
R20UT2203EG0102 Rev. 1.02 Page 8 of 37
Apr 04, 2014
2. Power Supply
2.1 Requirements
This RSK is supplied with an E1 debugger. The debugger is able to power the RSK board with up to 200mA.
When the RSK is connected to another system then that system should supply power to the RSK. This board
has an optional centre positive supply connector using a 2.0mm barrel power jack.
Details of the external power supply requirements for the RSK, and configuration are shown in Table 2-1
below. The default RSK power configuration is shown in bold, blue text.
J6 Setting J7 Setting J8 Setting Supply Type Board_VDD
Pin2-3 shorted Pin2-3 shorted All open PWR, VBUS, CON_5V 3.3V
Pin1-2 shorted Pin1-2 shorted Don’t care E1(3.3V), CON_3V3 3.3V
Pin2-3 shorted Pin2-3 shorted Pin1-2 shorted PWR, VBUS, CON_5V 1.8V
Pin2-3 shorted Pin2-3 shorted Pin2-3 shorted PWR, VBUS, CON_5V 1.62V
All open All open All open DO NOT SET ---
Table 2-1: Main Power Supply Requirements
2.2 Power-Up Behaviour
When the RSK is purchased, the RSK board has the ‘Release’ or stand-alone code from the example tutorial
software pre-programmed into the Renesas microcontroller. On powering up the board the LCD panel will
show ‘RL78’ in the bottom left and will respond to SW3 switch presses by performing an A/D conversion and
displaying the result in the main part of the LCD panel.
The main power supply connected to PWR1 should supply a minimum of 5W to ensure full functionality.

RSKRL78L1C 3. Board Layout
R20UT2203EG0102 Rev. 1.02 Page 9 of 37
Apr 04, 2014
3. Board Layout
3.1 Component Layout
Figure 3-1 below shows the top component layout of the board.
RL78/L1C
JA5
J4
J3
Application Headers Potentiometer User Switches
E1 Interface
User LEDs
Reset Switch
Power Jack
RS232 Serial
Application Headers
JA2
JA1
JA6
J2
J1
Power LED
Debug LCD
connector
JA4 (LCD Panel Connector)
LIN
USB
Figure 3-1: Board Layout

RSKRL78L1C 3. Board Layout
R20UT2203EG0102 Rev. 1.02 Page 10 of 37
Apr 04, 2014
3.2 Board Dimensions
Figure 3-2 below gives the board dimensions and connector positions. All the through-hole connectors are on
a common 0.1 inch grid for easy interfacing.
RL78/L1C
J4
J3
JA2
JA6
J2
J1
JA1
JA5
27.00mm
48.26mm
50.80mm
55.88mm
86.36mm
99.06mm
106.68mm
115.00mm
120.00mm
92.71mm
14.00mm
24.13mm
31.75mm
80.01mm
3.81mm
5.00mm
82.55mm
85.00mm
100.00mm
17.78mm
13.88mm 45.00mm
7.0mm 3.2mm 3.00mm
JA4 (LCD Panel Connector)
43.18mm
74.93mm
Figure 3-2: Board Dimensions

RSKRL78L1C 3. Board Layout
R20UT2203EG0102 Rev. 1.02 Page 11 of 37
Apr 04, 2014
3.3 Component Placement
Figure 3-3 below shows placement of individual components on the top-side PCB. Component types and
values can be looked up using the board schematics.
Figure 3-3: Top-Side Component Placement

RSKRL78L1C 4. Connectivity
R20UT2203EG0102 Rev. 1.02 Page 12 of 37
Apr 04, 2014
4. Connectivity
4.1 Internal RSK Connections
The diagram below shows the RSK board components and their connectivity to the MCU.
RL78/L1C
MCU
IRQ
Reset
ADC I/O
SW3
Switches
SW2 SW1
RESET
Potentiometer User LEDs Power
R
OG R
Power Jack
VDD
G
Application Headers
Micon Pin Header
MCU Current
Draw Test Point
E1 Debug Interface
RS-232 Serial Port
LCD Panel
Debug LCD
USB Function Port
LIN
Figure 4-1: Internal RSK Block Diagram

RSKRL78L1C 4. Connectivity
R20UT2203EG0102 Rev. 1.02 Page 13 of 37
Apr 04, 2014
4.2 Debugger Connections
The diagram below shows the connections between the RSK, E1 debugger and the host PC.
Host PC
E1 Emulator
RSK
User Interface
Cable USB Cable
Figure 4-2: Debugger Connection Diagram

RSKRL78L1C 5. User Circuitry
R20UT2203EG0102 Rev. 1.02 Page 14 of 37
Apr 04, 2014
5. User Circuitry
5.1 Reset Circuit
A reset control circuit is not fitted to the RSK, as the MCU is capable of voltage and power-on detection.
Resets are handled internally, and the reset switch is connected directly to the RESET pin on the MCU (pin
13).
5.2 Clock Circuit
A clock circuit is fitted to the RSK to generate the required clock signal to drive the MCU, and associated
peripherals. Refer to the RL78/L1C Group Hardware Manual for details regarding the clock signal
requirements, and the RSKRL78L1C board schematics for information regarding the clock circuitry in use on
the RSK. Details of the oscillators fitted to the board are listed in Table 5-1 below.
Crystal Function Default Placement Frequency Device Package
X1 Main MCU oscillator. Fitted 12MHz Encapsulated, SMT
X2 Sub MCU oscillator Fitted 32.768kHz Encapsulated, SMT
Table 5-1: Oscillators
5.3 Switches
There are four switches located on the RSK board. The function of each switch and its connection is shown in
Table 5-2. For further information regarding switch connectivity, refer to the RSK schematics.
Switch Function MCU
Port
Pin
RES When pressed, the microcontroller is reset. RESETn 13
SW1
Connects to an IRQ input for user controls.
INTP0 (P137)
16
SW2 Connects to an IRQ input for user controls. INTP1 (P03) 66
SW3
Connects to an IRQ input for user controls.
INTP2 (P04)
65
Table 5-2: Switch Connections

RSKRL78L1C 5. User Circuitry
R20UT2203EG0102 Rev. 1.02 Page 15 of 37
Apr 04, 2014
5.4 LEDs
There are five LEDs on the RSK. The function of each LED, its colour, and its connections are shown in Table
5-3.
LED Colour Function
MCU
Port Pin
POWER
Green
Indicates the power status
NC
-
LED0 Green User operated LED. P05 64
LED1
Orange
User operated LED.
P07
62
LED2 Red User operated LED. P41 11
LED3
Red
User operated LED.
P42
10
Table 5-3: LED Connections
5.5 Potentiometer
A single-turn potentiometer is connected as a potential divider to analog input ANI0, pin 4. The potentiometer
can be used to create a voltage between Board_VDD and ground.
The potentiometer is fitted to offer an easy method of supplying a variable analog input to the microcontroller. It does not
necessarily reflect the accuracy of the controller’s ADC. Refer to the RL78/L1C Group Hardware Manual for further
details.

RSKRL78L1C 5. User Circuitry
R20UT2203EG0102 Rev. 1.02 Page 16 of 37
Apr 04, 2014
5.6 LCD Panel
A versatile LCD display panel is supplied with the RSK, and should be connected to the JA4 header.
The panel is directly driven by circuitry inside the MCU. Connection information for the LCD panel is provided
in table Table 5-4 below.
LCD Panel Header (JA4)
Pin Circuit Net Name MCU Pin Pin Circuit Net Name MCU Pin
1 VL4 VL4, Pin 28 2 VL3 VL3, Pin 29
3 VL2 VL2, Pin 27 4 VL1 VL1, Pin 26
5
Ground
-
6
Ground
-
7 COM0 COM0, Pin 61 8 COM1 COM1, Pin 60
9 COM2 COM2, Pin 59 10 COM3 COM3, Pin 58
11 SEG0 SEG0, Pin 57 12 SEG1 SEG1, Pin 56
13 SEG2 SEG2, Pin 55 14 SEG3 SEG3, Pin 54
15 SEG4 SEG4, Pin 53 16 SEG5 SEG5, Pin 52
17
SEG6
SEG6, Pin 51
18
SEG7
SEG7, Pin 50
19 SEG8 SEG8, Pin 49 20 SEG9 SEG9, Pin 48
21 SEG10 SEG10, Pin 47 22 SEG11 SEG11, Pin 46
23 SEG12 SEG12, Pin 45 24 SEG13 SEG13, Pin 44
25 SEG14 SEG14, Pin 43 26 SEG15 SEG15, Pin 42
27 SEG16 SEG16, Pin 41 28 SEG17 SEG17, Pin 40
29 SEG18 SEG18, Pin 39 30 SEG19 SEG19, Pin38
31 SEG20 SEG20, Pin 37 32 SEG21 SEG21, Pin 36
33 SEG22 SEG22, Pin 35 34 SEG23 SEG23, Pin 34
35 SEG24 SEG24, Pin 33 36 SEG25 SEG25, Pin 32
37 SEG26 SEG26, Pin 31 38 SEG27 SEG27, Pin 30
39 SEG32 SEG32, Pin 85 40 SEG33 SEG33, Pin 84
41
SEG34
SEG34, Pin 83
42
SEG35
SEG35, Pin 82
43 SEG40 SEG40, Pin 77 44 SEG41 SEG41, Pin 76
45 SEG42 SEG42, Pin 75 46 SEG43 SEG43, Pin 74
47 DLCDD4_SEG44 SEG44, Pin 73 48 DLCDD5_SEG45 SEG45, Pin 72
49 DLCDD6_SEG46 SEG46, Pin 71 50 DLCDD7_SEG47 SEG47, Pin 70
Table 5-4: LCD Header Connections

RSKRL78L1C 5. User Circuitry
R20UT2203EG0102 Rev. 1.02 Page 17 of 37
Apr 04, 2014
5.7 Debug LCD Module
A debug LCD header is fitted to the RSK; however the two-line debug LCD is not supplied with this kit. It is not
possible to use the debug LCD and the LCD panel at the same time, and they should not both be fitted to the
RSK.
Care should be taken when installing the LCD module to ensure pins are not bent or damaged. The LCD module is
vulnerable to electrostatic discharge (ESD); therefore appropriate ESD protection should be used.
The debug LCD module uses a 4-bit interface to reduce pin allocation. Connection information for the debug
LCD module is provided in Table 5-5 below.
Debug LCD Header
Pin Circuit Net Name MCU Pin Circuit Net Name MCU
Port Pin Port Pin
1 GROUND - - 2 Board_5V - -
3 No Connection - - 4 DLCDRS P44 8
5 R/W (pulled to ground) - - 6 DLCDE (pulled to ground) P130 5
7 No Connection - - 8 No Connection - -
9 No Connection - - 10 No Connection - -
11
DLCDD4_SEG44
P14
73
12
DLCDD5_SEG45
P15
72
13 DLCDD6_SEG46 P16 71 14 DLCDD7_SEG47 P17 70
Table 5-5: LCD Header Connections
5.8 RS232 Serial Port
An RS232 serial port is fitted to the RSK and connected via a level shifter to the microcontroller Serial Array
Unit (SAU). Connections between the RS232 header and the microcontroller are listed in Table 5-6 below.
Signal Name Function MCU RS232 Connector
Pin
Signal
Pin
SO10_TXD1 SAU UART1 Transmit Signal. TXD1 67 Pin 2
SI10_RXD1
SAU UART1 Receive Signal
RXD1
68
Pin 3
SO00_TXD0 SAU UART0 Transmit Signal. TXD0 79 Pin 2*
SI00_RXD0
SAU UART0 Receive Signal
RXD0
80
Pin 3*
SO30_TXD3 SAU UART3 Transmit Signal. TXD3 32 Pin 2*
SI30_RXD3
SAU UART3 Receive Signal.
RXD3
33
Pin 3*
RS232TX External SCI Transmit Signal. n/a - Pin 2*
RS232RX
External SCI Receive Signal.
n/a
-
Pin 3*
Table 5-6: Serial Port Connections
* This connection is a not available in the default RSK configuration - refer to §6.2 for the required
modifications.

RSKRL78L1C 5. User Circuitry
R20UT2203EG0102 Rev. 1.02 Page 18 of 37
Apr 04, 2014
5.9 Local Interconnect Network (LIN)
A LIN transceiver IC is fitted to the RSK, and connected to the LIN MCU peripheral. For further details
regarding the LIN protocol and supported modes of operation, please refer to the RL78/L1C hardware manual.
Connections between the LIN connector and the microcontroller are listed in Table 5-7 below.
LIN Signal Function MCU
Port Pin
LINTXD LIN Transmit Signal P26 79
LINRXD LIN Receive Signal P25 80
LINNSLP LIN Transceiver Device Sleep Control P24 81
Table 5-7: LIN Connections
5.10 USB Function
A USB 2.0 function controller is contained within the MCU. Connections between the USB connector and the
microcontroller are listed in Table 5-8 below.
USB Signal Function MCU
Port Pin
UVBUS
Cable monitor pin.
UVBUS 93
UDP
Positive differential data signal.
UDP 95
UDM Negative differential data signal. UDM 94
Table 5-8: USB Connections

RSKRL78L1C 6. Configuration
R20UT2203EG0102 Rev. 1.02 Page 19 of 37
Apr 04, 2014
6. Configuration
6.1 Modifying the RSK
This section lists the option links that are used to modify the way RSK operates in order to access different
configurations. Configurations are made by modifying link resistors or headers with movable jumpers.
Table 6-1 below shows the RSKRL78L1C default configuration with respect to the peripheral functionality.
Bold, blue text indicates the default configuration that the RSK is supplied with. It is noted that certain
peripheral functions are disabled by default, as shown in Table 6.1 in the column entitled Secondary
Function. It is possible to activate these disabled peripherals, but at the expense of the default peripheral
functions as shown in the Table. Refer to the sections cited in the Table in order to perform any required
modifications.
The following sub-sections contain Tables illustrating which link resistors need to added/removed to
enable/disable specific functions. A single horizontal line in the Table traces an individual signal path from the
MCU on the left of the Table, through any intermediate connections, to any header connections on the right
side of the Table. Each line in the Table thereby shows how the MCU signal can be configured for each of its
multiplexed functions. Default RSK functional configurations are shown in bold, blue text.
A link resistor is a 0Ω surface mount resistor, which is used to short or isolate parts of a circuit. Option links
are listed in the following sections, detailing their function when fitted or removed. Refer to the component
placement diagram (§3.3) to locate the option links and jumpers.
When removing soldered components, always ensure that the RSK is not exposed to a soldering iron for intervals
greater than 5 seconds. This is to avoid damage to nearby components mounted on the board.
When modifying a link resistor, always check the related option links to ensure there is no possible signal contention or
short circuits. Because many of the MCU’s pins are multiplexed, some of the peripherals must be used exclusively.
Refer to the RL78/L1C Group Hardware Manual and RSKRL78L1C schematics for further information.
Primary Function See § Secondary Function See § Tertiary Function See §
RS232 with UART1 6.2 RS232 with UART0/3 6.2 E1 Debugger 6.3
LIN 6.2
6.10 Serial comms with SAU00 6.2 N/A
LCD Panel 6.4 UART3/INTP6/IO 6.4 N/A
LED1, LED2, LED3 6.5 TAU0 6.5 N/A
IIC 6.6 N/A N/A
On board Crystals 6.8 External clocks supplied 6.8 N/A
Table 6-1: RSK Default Configuration by Function