R5F21346CNFP#U0 Renesas Electronics America, R5F21346CNFP#U0 Datasheet - Page 748

• 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 715 of 723
34.17.1.3 How to Access
34.17.1.4 Rewriting User ROM Area
34.17.1.5 Programming
34.17.1.6 Entering Stop Mode or Wait Mode
34.17.1.7 Programming and Erasure Voltage for Flash Memory
34.17.1.8 Block Blank Check
34.17.1.9 Low-Current-Consumption Read Mode
To set one of the following bits to 1, first write 0 and then 1 immediately. Disable interrupts and DTC activation
between writing 0 and writing 1.
•
•
•
To set one of the following bits to 0, first write 1 and then 0 immediately. Disable interrupts and DTC activation
between writing 1 and writing 0.
•
In EW0 Mode, if the supply voltage drops while rewriting any block in which a rewrite control program is
stored, it may not be possible to rewrite the flash memory because the rewrite control program cannot be
rewritten correctly. In this case, use standard serial I/O mode.
Do not write additions to the already programmed address.
Do not enter stop mode or wait mode during erase-suspend.
If the FST7 in the FST register is set to 0 (busy (during programming or erasure execution)), do not enter to stop
mode or wait mode.
Do not enter stop mode or wait mode while the FMR27 bit is 1 (low-current-consumption read mode enabled).
To perform programming and erasure, use VCC = 2.7 V to 5.5 V as the supply voltage. Do not perform
programming and erasure at less than 2.7 V.
Do not execute the block blank check command during erase-suspend.
In low-speed clock mode and low-speed on-chip oscillator mode, the current consumption when reading the
flash memory can be reduced by setting the FMR27 bit in the FMR2 register to 1 (low-current-consumption
read mode enabled).
Low-current-consumption read mode can be used when the CPU clock is set to either of the following:
•
•
However, do not use low-current-consumption read mode when the frequency of the selected CPU clock is
3 kHz or below.
After setting the divide ratio of the CPU clock, set the FMR27 bit to 1 (low-current-consumption read mode
enabled).
To reduce the power consumption, refer to 32. Reducing Power Consumption.
Enter wait mode or stop mode after setting the FMR27 bit to 0 (low-current-consumption read mode disabled).
Do not enter wait mode or stop mode while the FMR27 bit is 1 (low-current-consumption read mode enabled).
The FMR01 bit or FMR02 bit in the FMR0 register
The FMR13 bit in the FMR1 register
The FMR20 bit, FMR22 bit, or FMR 27 bit in the FMR2 register
The FMR14 bit, FMR15 bit, FMR16 bit, or FMR17 bit in the FMR1 register
The CPU clock is set to the low-speed on-chip oscillator clock divided by 4, 8, or 16.
The CPU clock is set to the XCIN clock divided by 1 (no division), 2, 4, or 8.
34. Usage Notes