Datasheet

78K0/Kx2-L CHAPTER 23 REGULATOR
R01UH0028EJ0400 Rev.4.00 692
Sep 27, 2010
23.3 Cautions for Self Programming
1. Make sure that the regulator output voltage mode is fixed when executing self programming or EEPROM emulation.
2. The power supply voltage range in which the flash memory can be rewritten in normal power mode is V
DD ≥ 2.5 V.
Note that program area can be rewritten by using the self programming library in normal power mode.
3. Observe the following points when rewriting the flash memory in low power consumption mode:
• Data area can be rewritten in low power consumption mode, but program area cannot.
Data area: Flash memory area handled as data
Program area: Flash memory area handled as the program
• The flash memory cannot be rewritten in low power consumption mode if the power supply voltage is 2.0 V or
lower.
• Flash memory that is erased and written in low power consumption mode cannot be accessed in normal power
mode. To use this data in normal power mode, switch to low power consumption mode and transfer the flash
memory contents to RAM.
• A wait time of 2 ms is required before executing self programming after switching from normal power mode to low
power consumption mode.
Remark For details of the self-programming function and the self programming library, refer to “78K0
Microcontrollers User’s Manual Self Programming Library Type 01 (U18274E)” and “78K0
Microcontrollers Self Programming Library Type 01 Ver. 3.10 Operating Precautions (notification
document) (ZUD-CD-09-0122)”.
For details of the EEPROM emulation library, refer to “78K0 Microcontrollers User’s Manual EEPROM
Emulation Library Type 01 (U18275E)” and “78K0 Microcontrollers EEPROM Emulation Library Type
01 Ver.2.10 Operating Precautions (notification document) (ZUD-CD-09-0165)”.