R5F21238DFP#U0 Renesas Electronics America, R5F21238DFP#U0 Datasheet - Page 451

• 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 20.9
Figure 20.10
EW0 Mode Operating Procedure
Figure 20.9 shows the How to Set and Exit EW0 Mode. Figure 20.10 shows the How to Set and Exit EW1
Mode.
Jump to the rewrite control program which has been
transferred to the RAM.
(The subsequent process is executed by the rewrite
control program in the RAM.)
Transfer a rewrite control program which uses CPU
rewrite mode to the RAM.
NOTES:
1. Select 5 MHz or below for the CPU clock by the CM06 bit in the CM0 register and the CM16 to CM17 bits in the CM1 register.
2. When setting the FMR01 bit to 1, write 0 to the FMR01 bit before writing 1. Do not generate an interrupt between writing 0 and 1.
3. Disable the CPU rewrite mode after executing the read array command.
Write to the FMR01 bit in the RAM.
How to Set and Exit EW0 Mode
How to Set and Exit EW1 Mode
EW1 Mode Operating Procedure
Set CM0 and CM1 registers
Page 429 of 501
NOTE:
1. When setting the FMR01 bit to 1, write 0 to the FMR01 bit before writing 1.
Do not generate an interrupt between writing 0 and 1.
(1)
Write
(CPU rewrite mode enabled)
Write 0 to the FMR11 bit before writing
(EW1 mode)
0
Execute software commands
to the FMR01 bit before writing 0
(CPU rewrite mode disabled)
Write
Program in ROM
0
to the FMR01 bit
Rewrite control program
Jump to a specified address in the flash memory
Set the FMR01 bit by writing
Execute the read array command
(1)
(CPU rewrite mode enabled)
Execute software commands
(CPU rewrite mode enabled)
Write
1
0
to the FMR01 bit
0
and then
(2)
(3)
20. Flash Memory
1