R5F21346CNFP#U0 Renesas Electronics America, R5F21346CNFP#U0 Datasheet - Page 335

• Manufacturer Part Number: R5F21346CNFP#U0
• Description: MCU 1KB FLASH 32K ROM 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/34Cr

Specifications of R5F21346CNFP#U0

• Core Processor: R8C
• Core Size: 16/32-Bit
• Speed: 20MHz
• Connectivity: I²C, LIN, SIO, SSU, UART/USART
• Peripherals: POR, PWM, Voltage Detect, WDT
• Number Of I /o: 43
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 2.5K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 12x10b; D/A 2x8b
• Oscillator Type: Internal
• Operating Temperature: -20°C ~ 85°C
• Package / Case: 48-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/34C Group
REJ09B0586-0100 Rev.1.00 Jan 13, 2010
Page 302 of 723
19.9
19.9.1
19.9.2
19.9.3
19.9.4
•
•
Reading from the TRCSR register immediately after writing to it can result in the value previous to the write
being read out. To prevent this, execute the JMP.B instruction between the read and the write instructions.
To set bits TCK2 to TCK0 in the TRCCR1 register to 111b (fOCO-F), set fOCO-F to the clock frequency
higher than the CPU clock frequency.
•
Switching procedure
(1) Set the TSTART bit in the TRCMR register to 0 (count stops).
(2) Change the settings of bits TCK2 to TCK0 in the TRCCR1 register.
•
Switching procedure
(1) Set the TSTART bit in the TRCMR register to 0 (count stops).
(2) Change the settings of bits TCK2 to TCK0 in the TRCCR1 register.
(3) Wait for a minimum of two cycles of f1.
(4) Set the FRA00 bit in the FRA0 register to 0 (high-speed on-chip oscillator off).
The following note applies when the CCLR bit in the TRCCR1 register is set to 1 (clear TRC register at
compare match with TRCGRA register).
When using a program to write a value to the TRC register while the TSTART bit in the TRCMR register is
set to 1 (count starts), ensure that the write does not overlap with the timing with which the TRC register is set
to 0000h.
If the timing of the write to the TRC register and the setting of the TRC register to 0000h coincide, the write
value will not be written to the TRC register and the TRC register will be set to 0000h.
Reading from the TRC register immediately after writing to it can result in the value previous to the write
being read out. To prevent this, execute the JMP.B instruction between the read and the write instructions.
Stop the count before switching the count source.
After switching the count source from fOCO40M to another clock, allow a minimum of two cycles of f1 to
elapse after changing the clock setting before stopping fOCO40M.
Notes on Timer RC
TRC Register
TRCCR1 Register
Count Source Switching
TRCSR Register
Program Example
Program Example
L1:
L1:
MOV.W
JMP.B
MOV.W
MOV.B
JMP.B
MOV.B
#XXXXh, TRC
L1
TRC,DATA
#XXh, TRCSR
L1
TRCSR,DATA
;Write
;JMP.B instruction
;Read
;Write
;JMP.B instruction
;Read
19. Timer RC