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Section 18 ROM
Bit
Modes 1
Initial value
to 4, and 6
R/W
Modes 5
Initial value
and 7
R/W
Bit 7—Flash Write Enable Bit (FWE): Sets hardware protection against flash memory
programming/erasing. When using this bit, refer to section 18.9, Notes on Flash Memory
Programming/Erasing.
Bit 7:
FWE
Description
0
When a low level is input to the FWE pin (hardware-protected state)
1
When a high level is input to the FWE pin
Rev. 4.00 Jan 26, 2006 page 612 of 938
REJ09B0276-0400
7
6
5
FWE
SWE
ESU
0
0
0
R
R
R
1/0
0
0
R
R/W
R/W
Software write enable bit
Enables or disables the flash memory.
Flash write enable bit
Sets hardware protection against flash memory programming/erasing.
4
3
PSU
EV
PV
0
0
R
R
0
0
R/W
R/W
R/W
Erase-verify mode
Designates transition to
or exit from erase-verify
mode
Program setup
Prepares for a transition to program mode.
Erase setup
Prepares for a transition to erase mode.
2
1
0
E
P
0
0
0
R
R
R
0
0
0
R/W
R/W
Program mode
Designates
transition to
or exit from
program mode
Erase mode
Designates transition
to or exit from erase
mode
Program-verify mode
Designates transition to
or exit from program-verify
mode
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