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RL78/G1A CHAPTER 25 FLASH MEMORY
There are two flash memory programming modes: wide voltage mode and full speed mode. The supply voltage value
applied to the microcontroller during write operations and the setting information of the user option byte for setting of the
flash memory programming mode determine which mode is selected.
When a dedicated flash memory programmer is used for serial programming, setting the voltage on GUI selects the
mode automatically.
Table 25-5. Programming Modes and Voltages at Which Data Can Be Written, Erased, or Verified
<R>
User Option Byte Setting for Switching to Flash Memory
Programming Mode
Power Supply Voltage
(V
DD)
Flash Operation Mode Operating Frequency
Flash Programming Mode
Blank state Full speed mode
HS (high speed main) mode 1 MHz to 32 MHz Full speed mode
LS (low speed main) mode 1 MHz to 8 MHz Wide voltage mode
2.7 V ≤ VDD ≤ 3.6 V
LV (low voltage main) mode 1 MHz to 4 MHz Wide voltage mode
Blank state Full speed mode
HS (high speed main) mode 1 MHz to 16 MHz Full speed mode
LS (low speed main) mode 1 MHz to 8 MHz Wide voltage mode
2.4 V ≤ VDD < 2.7 V
LV (low voltage main) mode 1 MHz to 4 MHz Wide voltage mode
Blank state Wide voltage mode
LS (low speed main) mode 1 MHz to 8 MHz Wide voltage mode
1.8 V ≤ VDD < 2.4 V
LV (low voltage main) mode 1 MHz to 4 MHz Wide voltage mode
Remarks 1. Using both the wide voltage mode and full speed mode imposes no restrictions on writing, erasing, or
verification.
2. For details about communication commands, see 25.4.4 Communication commands.
R01UH0305EJ0200 Rev.2.00 811
Jul 04, 2013