R5F21346CNFP#U0 Renesas Electronics America, R5F21346CNFP#U0 Datasheet - Page 745

• 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 712 of 723
34.17 Notes on Flash Memory
34.17.1 CPU Rewrite Mode
Table 34.2
FMR21, FMR22: Bits in FMR2 register
EW0
EW1
Mode
34.17.1.1 Prohibited Instructions
34.17.1.2 Interrupts
The following instructions cannot be used while the program ROM area is being rewritten in EW0 mode
because they reference data in the flash memory: UND, INTO, and BRK.
Tables 34.2 to 34.4 show CPU Rewrite Mode Interrupts (1), (2) and (3), respectively.
Data
flash
Program
ROM
Data
flash
Program
ROM
Erase/
Target
Write
CPU Rewrite Mode Interrupts (1)
During auto-erasure
(suspend enabled)
During auto-erasure
(suspend disabled
During
auto-programming
During auto-erasure
(suspend enabled)
During auto-erasure
(suspend disabled)
During
auto-programming
During auto-erasure
(suspend enabled)
During auto-erasure
(suspend disabled
During
auto-programming
During auto-erasure
(suspend enabled)
During auto-erasure
(suspend disabled
During
auto-programming
or FMR22 = 0)
or FMR22 = 0)
or FMR22 = 0)
Status
When an interrupt request is acknowledged, interrupt handling is executed.
If the FMR22 bit is set to 1 (erase-suspend request enabled by interrupt request),
the FMR21 bit is automatically set to 1 (erase-suspend request). The flash memory
suspends auto-erasure after td(SR-SUS).
If erase-suspend is required while the FMR22 bit is set to 0 (erase-suspend request
disabled by interrupt request), set the FMR21 bit to 1 during interrupt handling. The flash
memory suspends auto-erasure after td(SR-SUS).
While auto-erasure is being suspended, any block other than the block during auto-
erasure execution can be read or written. Auto-erasure can be restarted by setting the
FMR21 bit to 0 (erase restart).
Interrupt handling is executed while auto-erasure or auto-programming is being
performed.
Usable by allocating a vector in RAM.
When an interrupt request is acknowledged, interrupt handling is executed.
If the FMR22 bit is set to 1, the FMR21 bit is automatically set to 1. The flash memory
suspends auto-erasure after td(SR-SUS).
If erase-suspend is required while the FMR22 bit is set to 0, set the FMR21 bit to 1 during
interrupt handling. The flash memory suspends auto-erasure after td(SR-SUS).
While auto-erasure is being suspended, any block other than the block during auto-
erasure execution can be read or written. Auto-erasure can be restarted by setting the
FMR21 bit to 0.
Interrupt handling is executed while auto-erasure or auto-programming is being
performed.
Auto-erasure suspends after td(SR-SUS) and interrupt handling is executed. Auto-
erasure can be restarted by setting the FMR21 bit to 0 after interrupt handling completes.
While auto-erasure is being suspended, any block other than the block during auto-
erasure execution can be read or written.
Auto-erasure and auto-programming have priority and interrupt requests are put on
standby. Interrupt handling is executed after auto-erase and auto-program complete.
Maskable Interrupt
34. Usage Notes