Renesas RZ/A1H Series Installation and operating instructions

APPLICATION NOTE
R30AN0230EG0100 Rev. 1.00
Page 1 of 22
16 Oct 2015
RZ/A1H Group
TFT Backlight Control using Motor Control PWM Timer Peripheral
Introduction
This application note describes how to use the Motor Control PWM Timer Peripheral of the RZ/A1H microcontroller to
provide a single variable duty-cycle PWM output. In this example, the PWM output is used to dynamically adjust the
brightness of a TFT Display attached to an RSK+RZ/A1H demonstration/development board. This application note is
supported by an embedded C project, developed in the e2 studio IDE.
Target Device
RZ/A1H
When applying the sample program covered in this application note to another microcontroller, modify the program
according to the specifications for the target microcomputer and conduct an extensive evaluation of the modified
program.
R30AN0230EG0100
Rev.1.00
16 Oct 2015

RZ/A1H Group TFT Backlight Control using Motor Control PWM Timer Peripheral
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Contents
1. Specification...................................................................................................................3
2. Application Environment...............................................................................................4
3. Hardware.........................................................................................................................5
3.1 Hardware Scheme.......................................................................................................................5
3.2 RSK Configuration......................................................................................................................5
3.2.1 Switches..................................................................................................................................5
3.2.2 Jumpers ..................................................................................................................................6
3.2.3 Resistor modifications.............................................................................................................6
4. Software..........................................................................................................................7
4.1 User Operation of Sample..........................................................................................................7
4.2 Operation Overview ....................................................................................................................7
4.2.1 Operation Description .............................................................................................................7
4.2.2 Setting Cycle and Duty ...........................................................................................................8
4.3 Peripheral Function Settings .....................................................................................................8
4.4 Interrupts......................................................................................................................................9
4.5 Fixed Width Variables.................................................................................................................9
4.6 List of Constants/Error Codes.................................................................................................10
4.7 List of Structures/Unions .........................................................................................................12
4.8 Function Specifications............................................................................................................12
4.8.1 R_PWM_SampleMain...........................................................................................................12
4.8.2 R_PWM_Initialise..................................................................................................................13
4.8.3 R_PWM_SetDuty2A .............................................................................................................13
4.8.4 R_PWM_SetPeriod2.............................................................................................................13
4.8.5 R_PWM_StartTimer2............................................................................................................14
4.8.6 R_PWM_StopTimer2............................................................................................................14
4.8.7 pwm_interrupt_cmf2 .............................................................................................................14
4.8.8 R_PWM_CM2InterruptCallback............................................................................................14
4.8.9 pwm_controller......................................................................................................................15
4.8.10 pwm_vary_duty.....................................................................................................................15
4.9 Flowcharts .................................................................................................................................16
4.9.1 Peripheral Initialisation..........................................................................................................16
4.9.2 Main Processing....................................................................................................................17
5. Reference Documents..................................................................................................18

RZ/A1H Group TFT Backlight Control using Motor Control PWM Timer Peripheral
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1. Specification
In this application, the Motor Control PWM Timer peripheral of the RZ/A1H microcontroller is configured to produce a
32kHz PWM waveform to the backlight control pin of the TFT display that connects to the RSK board. This PWM
signal is dynamically controlled either by adjusting the potentiometer RV1 or by the switches SW1 –SW3 onboard the
RSK. The application is set up to put the Renesas logo onto the display and a simple demonstration of the touch
capabilities of the display.
Figure 1-1 Board Layout
CN44

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2. Application Environment
The sample code accompanying this application note has been run and confirmed under the conditions below.
Table 3.1 Application Environment
The peripherals used for the PWM backlight control and their function within the application are described in Table 2-1.
Table 2-1 Required Peripheral Function and their Use
Peripheral Function
Application
MCU used
RZ/A1H
Operating frequency
CPU clock (Iφ): 400 MHz
Image processing clock (Gφ): 266.67MHz
Internal bus clock (Bφ): 133.33MHz
Peripheral clock 1 (P1φ): 66.67MHz
Peripheral clock 0 (P0φ): 33.33MHz
Operating voltage
Power supply voltage (I/O): 3.3V
Power supply voltage (internal): 1.18V
Integrated development environment
(IDE)
e2studio (version 4.0.1.007)
C compiler
KPIT GNUARM-NONE-EABI Toolchain v.14.02
Debugger
Segger J-Link
Board used
RSK+RZ/A1H board and TFT display
Peripheral
Function
Motor PWM Control Timer
This peripheral is configured to output a PWM signal
from the pin PWM2B, operating from timer channel two.
Peripheral Clock 0 ( P0φ) (32MHz)
Clock supply for motor control PWM timer peripheral
Interrupt Controller Compare Match Interrupt
(INTC_ID_CMI2)
This interrupt is generated at the start of the PWM
period. It is used to update the motor control PWM duty
cycle.

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3. Hardware
3.1 Hardware Scheme
The PWM signal is generated by the MCU on port 3-1 (Pin AA7). This is routed to the backlight pin of the display, pin
34 of connector CN44, via an option link on the RSK. See section 3.2.3 for details of resistor link settings required for
correct sample operation.
Figure 3-1 Connection of Backlight Control from MCU to Display
3.2 RSK Configuration
Please make sure that the RZA1H being used with this sample code has the following settings.
3.2.1 Switches
Please make sure that SW4 has the settings listed in Table 3-1.
Table 3-1 SW4 Settings
Please ensure that SW6 has the settings specified in Table 3-2.
Table 3-2 SW6 Settings
SW4
SW4-1
SW4-2
SW4-3
SW4-4
SW4-5
SW4-6
SW4-7
SW4-8
State
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
SW6
SW6-1
SW6-2
SW6-3
SW6-4
SW6-5
SW6-6
State
OFF
ON
OFF
ON
ON
ON
RZ/A1H
P3_1/PWM2B
Connector (CN44)
Output from pin No.34
TFT Display

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3.2.2 Jumpers
Please ensure that the following only the following jumper are fitters on the board in use.
JP11 1-2 connected
JP12 1-2 connected
JP21 1-2 connected
JP18 1-2 connected
PWR_SEL 2-3 connected if power supplied from 5V, 1-2 connected if power supplied from 12V. Please refer
to RSK+RZ/A1H User’s Manual section 2.1 for further information if required.
3.2.3 Resistor modifications
Some resistor modifications are needed for the RSK+RZA1H in order to achieve the correct operation of the sample
program, these are:
Remove R106 (Disconnects IRQ_AUDIO signal from RZA1 port pin P3_1)
Ensure that R107 is not fitted (not fitted as default). (Disconnects IRQ_PORTX signal from RZA1 port pin
P3_1)
Fit R186 (Connects BL_PWM_CTRL to RZA1H port pin P3_1)
The resistors locations are shown in Figure 3-2 below:
Figure 3-2 Location of modified resistors
It is essential that if a 12V supply is used that PWR_SEL is NOT linked on pins 2-3 or an overvoltage will be
applied to the MCU and associated devices, resulting in likely destruction of the whole board

RZ/A1H Group TFT Backlight Control using Motor Control PWM Timer Peripheral
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4. Software
4.1 User Operation of Sample
Refer to the RSK Quickstart Guide (QSG) for instructions on how to import the project into the e2studio workspace.
The sample code can be built and loaded on the RZA1H in either HardwareDebug or Release mode. When the program
is running, the panel records up to 5 discrete low pressure touches. The brightness of the LCD panel can be controlled
using the onboard potentiometer(RV1) and the switches (SW2 and SW3). SW1 can be used to used to toggle between
controlling the brightness using the switches and the potentiometer.
4.2 Operation Overview
The Motor Control PWM Timer channel is configured to use channel two (PWM2B) to output a variable PWM
waveform to the TFT display via port 3_1. Channel two is set to generate a compare match interrupt at the start of the
PWM cycle. This interrupt is used to dynamically update the duty cycle of the PWM signal being delivered to the
backlight control pin. As the Timer is 10bit, the programmable duty cycle varies from 0 to 1023 ( 0% to 100%). Table
4-1 provides an illustration of the relationship between them.
PWM Timer Duty Setting
LCD Screen Brightness (Duty Cycle) (%)
102
10
512
50
1023
100
Table 4-1 Relationship between PWM Output Ratios LCD Brightness
4.2.1 Operation Description
After the system initialisation, the program flow enters the main function in main.c, which calls the
R_PWM_SampleMain function (in r_pwm_user.c). This initialises the PWM Motor Timer peripheral and then enters an
infinite loop. Control of the PWM duty cycle, switch handling are carried out entirely within interrupt functions.
Updating the screen is carried out in the background loop.
Duty cycle control is carried out in function “pwm_vary_duty” in r_pwm_user.c which is called when the PWM timer
compare match interrupt is generated. If the code is in Pot mode, the current voltage on the pot RV1 is sampled here by
the ADC, and applied to the PWM duty cycle. If the code is in Switch mode, the interrupt function checks for any
switch presses and updates the duty cycle accordingly.
Switch control is carried out in function “pwm_controller”in r_pwm_user.c which is called when any of the IRQ
interrupts are generated. It also incorporates a 10ms time-out delay, to minimize switch-bouncing effects. The interrupt
function sets flags according to which switch was pressed, and these flags are picked up by the PWM timer interrupt
function when it is updating the duty cycle.
Code for initialising and controlling the Motor Control PWM Timer is contained in the file r_pwm_motor.c.

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4.2.2 Setting Cycle and Duty
The PWM output (PWB2B) is selected by setting OTS bit in PWDTR_2A register to 1. When compare match happens
between PWCNT_2 (counter) and PWCYR_2 (period), the output pin PWM2B is set high, at the start of the cycle.
PWM output goes low when another compare match occurs between PWCNT_2 (counter) and PWBFR_2A (duty
register). In this sample code, the polarity of the PWM output has been set to direct output in the PWPR_2 register.
Figure 4-1 shows graphically the operation of the period register PWCYR, the counter register PWCNT and the duty
register PWBFR to generate the PWM waveform on PWM2B.
Figure 4-1 Description of PWM Operation
4.3 Peripheral Function Settings
Table 4-2 lists the peripheral settings.
Module
Settings
Motor Control PWM Timer
Channel 2
Count clock frequency: P0φ/1 = 33.33MHz
PWM signal frequency: P0φ/1/1023 = 32.58kHz
PWM signal period: 1023/33.33MHz = 30.7us
Source of counter clear: PWCYR_2
Clock Pulse Generator (CPG)
Clock is supplied to Motor Control PWM Timer
Ports
Port 3_1 configured as peripheral controlled output
PWM2B
Interrupt Controller
IRQ3 configured for SW1 (interrupt ID 35).
IRQ2 configured for SW2 (interrupt ID 34).
IRQ5 configured for SW3 (interrupt ID 37).
Motor Control PWM Timer channel 2 compare match
interrupt (CMI2, Interrupt ID: 165).
Table 4-2 Peripheral Function Setting
OTS (PWDTR_2B) = 0
OTS (PWDTR_2B) = 1
OTS (PWDTR_2B) = 1
PWBFR_2
AA
PWCYR_2
PWM2B
PWCNT_2

RZ/A1H Group TFT Backlight Control using Motor Control PWM Timer Peripheral
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4.4 Interrupts
Table 4-3 lists interrupts used in the sample code.
Interrupt Source (Interrupt ID)
Priority
Processing Overview
CMI2 (165)
8
Interrupt generated by PWCYR_2
compare match.
Set the value of the next duty cycle
in the PWBFR_2A register.
ADI (ID:170)
5
Processing outline sets the flag for
signaling the end of A/D conversion
and clears the interrupt request ADF.
Processing time:
964.8 ns (maximum)
IRQ2 (ID:34)
15
Interrupt generated when SW2 is
pressed.
IRQ3 (ID: 35)
15
Interrupt generated when SW1 is
pressed.
IRQ5 (ID: 37)
15
Interrupt generated when SW3 is
pressed.
Table 4-3 Interrupts Used in Sample Code
4.5 Fixed Width Variables
Table 4-4 lists fixed-width variables used in sample code.
Symbol
Description
char_t
8-bit character
bool_t
Logical type. The value is true (1) or false (0).
int_t
High-speed integer, signed
32-bit integers are used in this sample code
int8_t
8-bit integer, signed (defined in the standard library)
int16_t
16-bit integer, signed (defined in the standard library)
int32_t
32-bit integer, signed (defined in the standard library)
int32_t
64-bit integer, signed (defined in the standard library)
uint8_t
8-bit integer, unsigned (defined in the standard library)
uint16_t
16-bit integer, unsigned (defined in the standard library)
uint32_t
32-bit integer, unsigned (defined in the standard library)
uint64_t
64-bit integer, unsigned (defined in the standard library)
float32_t
32-bit floating point number (defined in the standard library when
"__ARM_NEON__" is specified)
float64_t
64-bit floating point number (defined in the standard library) (defined in the
standard library when "__ARM_NEON__" is specified)
float128_t
128-bit floating point number
Table 4-4 Fixed-width Variables Used in Sample Code

RZ/A1H Group TFT Backlight Control using Motor Control PWM Timer Peripheral
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4.6 List of Constants/Error Codes
Table 4-5 lists the constants used in the sample program and Table 4-6 lists the error codes.
Constant
Setting
Description
PWM_INT_PRIORITY1
PWM_INT_PRIORITY2
8u
PWM interrupt priority
PWM_SRC_CLK_MAX
5ul
Total number of different clock
frequencies
PWM_CH1
0L
Channel 1 of the PWM unit
PWM_CH2
1L
Channel 2 of the PWM unit
POT_MODE
0u
To control the duty cycle using the
potentiometer
SWITCH_MODE
1u
To control the duty cycle using SW2
and SW3
PWM_CNT_START
0x08u
PWM counter start
PWM_IE_ENABLE
0x20u
PWM interrupt enable
PWM_CMF_CLEAR
0x10u
Clear PWM CMF flag
PWM_CLK1
0x00u
P0φ
PWM_CLK2
0x10u
P0φ/2
PWM_CLK3
0x20u
P0φ/4
PWM_CLK4
0x30u
P0φ/8
PWM_CLK5
0x40u
P0φ/16
PWM_CLK_NG
0xFFu
Not a register value of counter clock
PWM_POLARITY_A
0x01u
PWM inverse output of A
PWM_POLARITY_B
0x02u
PWM inverse output of B
PWM_POLARITY_C
0x03u
PWM inverse output of C
PWM_POLARITY_D
0x04u
PWM inverse output of D
PWM_POLARITY_E
0x05u
PWM inverse output of E
PWM_POLARITY_F
0x06u
PWM inverse output of F
PWM_POLARITY_G
0x07u
PWM inverse output of G
PWM_POLARITY_H
0x08u
PWM inverse output of H
PWM_CLK_SUPPLY
0x01u
Halt PWM clock supply
PWM_OTS_A
0x0000u
Output terminal select PWMnA
PWM_OTS_B
0x1000u
Output terminal select PWMnB
PWM_OTS_C
0x0000u
Output terminal select PWMnC
PWM_OTS_D
0x1000u
Output terminal select PWMnD
PWM_OTS_E
0x0000u
Output terminal select PWMnE
PWM_OTS_F
0x1000u
Output terminal select PWMnF
PWM_OTS_G
0x0000u
Output terminal select PWMnG
PWM_OTS_H
0x1000u
Output terminal select PWMnH

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Constant
Setting
Description
PWM_BUFFER_MASK
0x03FFu
Mask the control and reserved bits of
register PWBFR
PWM_PERIOD_MASK
0x03FFu
Mask for period register
PWM_BTC1A_DISABLE
0x01u
Disable data transfer from register
PWBFR_1A
PWM_BTC1C_DISABLE
0x02u
Disable data transfer from register
PWBFR_1C
PWM_BTC1E_DISABLE
0x04u
Disable data transfer from register
PWBFR_1E
PWM_BTC1G_DISABLE
0x08u
Disable data transfer from register
PWBFR_1G
PWM_BTC2A_DISABLE
0x10u
Disable data transfer from register
PWBFR_2A
PWM_BTC2C_DISABLE
0x20u
Disable data transfer from register
PWBFR_2C
PWM_BTC2E_DISABLE
0x40u
Disable data transfer from register
PWBFR_2E
PWM_BTC2G_DISABLE
0x80u
Disable data transfer from register
PWBFR_2G
PWM_CYCLE
1023u
Value of PWM period
MAX_DUTY_CYCLE
1023u
Maximum value of PWM duty cycle
MIN_DUTY_CYCLE
10u
Minimum value of PWM duty cycle
INITIAL_DUTY_CYCLE
512u
Value to be used during initialization
of PWM
Table 4-5 List of Constants
Constant
Setting
Description
MOTOR_PWM_SUCCESS
0L
Value to be returned on
successful completion of code
execution
MOTOR_PWM_ERROR_CLK
-1L
Non-existent clock error value
MOTOR_PWM_ERROR_UNSUPPORT_CLK
-2L
Wrong clock register value error
value
Table 4-6 Error Codes from Sample Code

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4.7 List of Structures/Unions
/*== the kind of clock count ==*/
typedef enum clock_count
{
CLOCK_COUNT_1, /* internal clock P0/1 */
CLOCK_COUNT_2, /* internal clock P0/2 */
CLOCK_COUNT_4, /* internal clock P0/4 */
CLOCK_COUNT_8, /* internal clock P0/8 */
CLOCK_COUNT_16 /* internal clock P0/16 */
} clock_count_t;
/*== the structure of a channel and a clock ==*/
typedef struct ch_clock
{
clock_count_t clock; /* the kind of counter clock */
/* register data of each channel at the time of clock */
uint8_t reg_data[PWM_CNT_CLK_MAX];
} ch_clock_t;
4.8 Function Specifications
This section contains the specifications for the functions that implement the backlight PWM controlin the sample code.
4.8.1 R_PWM_SampleMain
Synopsis PWM sample program’s main processing section
Header r_pwm_user.h
Source Location r_pwm_user.c
Declaration int32_t R_PWM_SampleMain(void)
Description The main processing section of the PWM sample program. Sets up PWM control and switch
handling, then runs graphics handling in background.
Arguments none
Return int32_t

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4.8.2 R_PWM_Initialise
Synopsis Initialise Motor Control PWM Timer unit
Header r_pwm_motor.h
Source Location r_pwm_motor.c
Declaration int32_t R_PWM_Initialise(const clock_count_t clock_count1,
const clock_count_t clock_count2)
Description This function initialises the Motor Control PWM timer as follows:
1. Sets the PWM output to direct polarity
2. Sets the PWM clock to value from function parameters
3. Set up and enable PWM interrupts
4. Enable data transfer on compare match
5. Configure output port.
Arguments clock_count_t clock_count1, clock_count_t clock_count2.
Timer clock frequency. See 0 for details of the typedef.
Return Result:
1. 0 - initialization successful
2. -1 –clock error
3. -2 –clock register error
4.8.3 R_PWM_SetDuty2A
Synopsis Set PWM duty cycle for channel 2A
Header r_pwm_motor.h
Source Location r_pwm_motor.c
Declaration void R_PWM_SetDuty (uint16_t pwm_duty)
Description This function sets PWM duty cycle for channel 2A
Arguments pwm_duty –0 to 1023
Return none
4.8.4 R_PWM_SetPeriod2
Synopsis Set PWM period for channel 2
Header r_pwm_motor.h
Source Location r_pwm_motor.c
Declaration void R_PWM_SetPeriod2 (uint16_t period)
Description This function sets PWM period for counter2
Arguments period - 0 to 1023
Return none

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4.8.5 R_PWM_StartTimer2
Synopsis Start PWM counter 2
Header r_pwm_motor.h
Source Location r_pwm_motor.c
Declaration void R_PWM_StartTimer (void)
Description This function starts the PWM counter 2
Arguments none
Return none
4.8.6 R_PWM_StopTimer2
Synopsis Stop PWM counter
Header r_pwm_motor.h
Source Location r_pwm_motor.c
Declaration void R_PWM_StopTimer2 (void)
Description This function stops PWM counter2
Arguments none
Return none
4.8.7 pwm_interrupt_cmf2
Synopsis PWM interrupt handler for timer 2
Header r_pwm_motor.h
Source Location r_pwm_motor.c
Declaration static void pwm_interrupt_cmf2 (uint32_t cmf)
Description This function handles the compare-match ISR then calls the callback function.
Arguments int32_t cmf
Return None
4.8.8 R_PWM_CM2InterruptCallback
Synopsis Registers a function to be called when a PWM interrupt is generated.
Header r_pwm_motor.h
Source Location r_pwm_motor.c
Declaration static void R_PWM_CM2InterruptCallback(void)
Description Registers a function to be called when an interrupt is generated for timer 2 compare-match
Arguments void (*func) (void)
Return None

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4.8.9 pwm_controller
Synopsis Handles switch presses
Header r_pwm_user.h
Source Location r_pwm_user.c
Declaration static void pwm_controller (void)
Description Run from switch IRQ interrupts, this function toggles between switches and potentiometer to
control duty cycle, and controls flags to increment or decrement duty cycle based on switch
presses
Arguments None
Return None
4.8.10 pwm_vary_duty
Synopsis Alters the value of PWM duty cycle
Header r_pwm_user.h
Declaration static void pwm_vary_duty (void)
Description Run from PWM Timer compare-match interrupt, this function alters the value of duty cycle
based on switch presses or potentiometer ADC reading.
Arguments None
Return None

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4.9 Flowcharts
4.9.1 Peripheral Initialisation
Run from then main function, the function init_periph initializes the RIIC, switches, LEDs and the ADC.
R_RIIC_RskInit
R_SWITCHES_Init
R_LED_Init
R_ADC_Open
init_periph
End
Figure 4-2 Peripheral Initialisation Flow Chart

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4.9.2 Main Processing
Figure 4-3 Backlight Background Program Flow
while (1)
R_PWM_SampleMain()
R_PWM_SetPeriod2()
R_PWM_Initialise()
Set pwm compare-match
callback function
R_PWM_SetDuty2A()
Set switch callback function
R_PWM_StartTimer2()
R_GRAPHICS_GraphicsSampleUPD()

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5. Reference Documents
User's Manual: Hardware
RZ/A1H Group User's Manual: Hardware Rev.1.00 R01UH0403EJ
The latest version can be downloaded from the Renesas Electronics website.
Application Notes:
RZ/A1H Group I/O definition header file <iodefine.h> R01AN1860EJ
RZ/A1H Group Example of Initialization (R01AN1864EJ)
RSK+ RZ/A1H User Manual R20UT3007EG
RSK+ RZ/A1H Tutorial Manual R20UT3008EG
The latest versions can be downloaded from the Renesas Electronics website.
Technical Update/Technical News
The latest information can be downloaded from the Renesas Electronics website.

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Website and Support
Renesas Electronics Website
http://www.renesas.com/
Inquiries
http://www.renesas.com/contact/

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Revision History
Rev.
Date
Description
Page
Summary
1.00
16 Oct 2015
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