R5F21356CNFP#U0 Renesas Electronics America, R5F21356CNFP#U0 Datasheet - Page 679

• Manufacturer Part Number: R5F21356CNFP#U0
• Description: MCU 1KB FLASH 32K ROM 52-LQFP
• Manufacturer: Renesas Electronics America
• Series: R8C/3x/35Cr

Specifications of R5F21356CNFP#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: 47
• 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: 52-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -

R8C/35C Group
REJ09B0567-0100 Rev.1.00 Dec. 14, 2009
Page 646 of 725
Figure 31.14
31.4.11.5 Lock Bit Program Command
This command is used to set the lock bit of any block in the program ROM area to 0 (locked).
When 77h is written in the first bus cycle and D0h is written in the second bus cycle to the starting block
address, 0 is written to the lock bit of the specified block. Make sure the address value in the first bus cycle is
the same address as the starting block address specified in the second bus cycle.
Figure 31.14 shows a Lock Bit Program Flowchart. The lock bit status (lock bit data) can be read using the read
lock bit status command.
The FST7 bit in the FST register can be used to confirm whether writing to the lock bit has completed.
Refer to 31.4.10 Data Protect Function for the lock bit function and how to set the lock bit to 1 (not locked).
Lock Bit Program Flowchart
Write the command code 77h
Write D0h to the starting
block address
Full status check
Completed
FST7 = 1?
Start
Yes
No
FST7: Bit in FST register
31. Flash Memory