R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 189

• 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
Figure 14.26
14.2.5.3
The following two workarounds should be performed in programmable one-shot generation mode.
•
(3) To stop the timer counting in the primary period, use the TSTOP bit in the TRBCR register. In this case,
(1) To write to registers TRBPRE and TRBPR during count operation (TCSTF bit is set to 1), note the
•
•
(2) Do not set both the TRBPRE and TRBPR registers to 00h.
Workaround example (b):
As shown in Figure 14.26 detect the start of the primary period by the TRBO pin output level and write to
registers TRBSC and TRBPR. These write operations must be completed by the beginning of period A.
If the port register’s bit value is read after the port direction register’s bit corresponding to the TRBO pin is
set to 0 (input mode), the read value indicates the TRBO pin output value.
When the TRBPRE register is written continuously during count operation (TCSTF bit is set to 1), allow
three or more cycles of the count source for each write interval.
When the TRBPR register is written continuously during count operation (TCSTF bit is set to 1), allow
three or more cycles of the prescaler underflow for each write interval.
bit corresponding to the TRBO pin
registers TRBPRE and TRBPR are initialized and their values are set to the values after reset.
following points:
(when the bit in the port direction
Read value of the port register’s
Programmable one-shot generation mode
Workaround Example (b) When TRBO Pin Output Value is Read
TRBO pin output
register is set to 0)
is detected at the end of the
The TRBO output inversion
underflow signal
Page 167 of 501
Count source/
secondary period.
prescaler
(i)
(ii) (iii)
Upon detecting (i), set the secondary and
then the primary register immediately.
Primary period
Ensure sufficient time
Secondary period
Period A
14. Timers