R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 504

• Manufacturer Part Number: R5F21238DFP#U0
• Description: IC R8C/23 MCU FLASH 48-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/2x/23r

Specifications of R5F21238DFP#U0

• Core Size: 16/32-Bit
• Program Memory Size: 64KB (64K x 8)
• Peripherals: POR, Voltage Detect, WDT
• Core Processor: R8C
• Speed: 20MHz
• Connectivity: CAN, I²C, LIN, SIO, SSU, UART/USART
• Number Of I /o: 41
• Program Memory Type: FLASH
• Ram Size: 3K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 12x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 48-LQFP
• No. Of I/o's: 41
• Ram Memory Size: 3KB
• Cpu Speed: 20MHz
• No. Of Timers: 4
• Digital Ic Case Style: LQFP
• Embedded Interface Type: CAN, I2C, UART
• Rohs Compliant: Yes
• Cpu Family: R8C
• Device Core Size: 16b
• Frequency (max): 20MHz
• Interface Type: I2C/UART
• Total Internal Ram Size: 3KB
• # I/os (max): 41
• Number Of Timers - General Purpose: 5
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 3V
• On-chip Adc: 12-chx10-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 48
• Package Type: LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: RCDK8C - KIT DEV EVAL FOR CAN R8C/23R0K521237S000BE - KIT DEV RSK R8C/23R0E521237CPE00 - EMULATOR COMPACT R8C/20/21/22/23
• Eeprom Size: -
• Lead Free Status / Rohs Status: Compliant

R8C/22 Group, R8C/23 Group
Rev.2.00 Aug 20, 2008
REJ09B0251-0200
22.3.4
22.3.4.1
22.3.4.2
Timer RE has the TSTART bit for instructing count start or stop, and the TCSTF bit which indicates count start
or stop. The TSTART and TCSTF bits are in the TRECR1 register.
Timer RE starts counting when setting the TSTART bit to 1 (count starts) and the TCSTF bit is set to 1 (count
starts). It takes the time for up to 2 cycles of the count source until the TCSTF bit is set to 1 after setting the
TSTART bit to 1. During this time, do not access registers associated with Timer RE
bit.
Also, timer RE stops counting when setting the TSTART bit to 0 (count stops) and the TCSTF bit is set to 0
(count stops). It takes the time for up to 2 cycles of the count source until the TCSTF bit is set to 0 after setting
the TSTART bit to 0. During this time, do not access registers associated with timer RE other than the TCSTF
bit.
NOTE:
Write to the following registers or bits while timer RE stops.
The state while Timer RE stops is indicated as the state where the TSTART and TCSTF bits in the TRECR1
register are set to 0 (timer RE stops).
Also, set all above-mentioned registers and bits (immediately before timer RE count starts) before setting the
TRECR2 register.
1. Registers associated with Timer RE: TRESEC, TREMIN, TRECR1, TRECR2, TRECSR
•
•
•
TRESEC and TRECR2 registers
The INT bit in TRECR1 register
RCS0 to RCS2 bits in TRECSR register
Notes on Timer RE
Starting and Stopping Count
Register Setting
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other than the TCSTF
22. Usage Notes