Bits 5 to 4—Reserved: Read-only bits, always read as 0.
Bit 3—Erase-Verify Mode (EV)
*1
: Selects transition to or exit from erase-verify mode.
Bit 3
EV
Description
0
Exit from erase-verify mode
(Initial value)
1
Transition to erase-verify mode
Bit 2—Erase-Verify Mode (PV)
*1
: Selects transition to or exit from program-verify mode.
Bit 2
PV
Description
0
Exit from program-verify mode
(Initial value)
1
Transition to program-verify mode
Bit 1—Erase Mode (E)
*1, *2
: Selects transition to or exit from erase mode.
Bit 1
E
Description
0
Exit from erase mode
(Initial value)
1
Transition to erase mode
Bit 0—Program Mode (P)
*1, *2
: Selects transition to or exit from program mode.
Bit 0
P
Description
0
Exit from program mode
(Initial value)
1
Transition to program mode
Notes: 1. Do not set two or more of these bits simultaneously. Do not turn off power supply
(V
CC
–V
PP
) while a bit is set.
2. For each bit setting procedure, follow the algorithm described in section 18.7,
Programming and Erasing Flash Memory. For the notes on programming and erasing,
refer to section 18.10, Flash Memory Programming and Erasing Precautions.
Particularly, be sure to set the watchdog timer beforehand to prevent program runaway,
when the E or P bit is set.
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