Table of Contents
Advertisement
M16C/62P Group (M16C/62P, M16C/62PT)
Table 22.2 Flash Memory Rewrite Modes Overview
Flash Memory
CPU rewrite Mode
Rewrite Mode
Function
The User ROM area is
rewritten when the CPU
executes software
commands.
EW0 mode:
Rewrite in areas other than
flash memory
EW1 mode:
Can be rewritten in the
flash memory
Areas which
User ROM area
can be
Rewritten
Operation
Single-chip mode
Mode
Memory expansion mode
(EW0 mode)
Boot mode (EW0 mode)
ROM
None
Programmer
NOTES:
1. The PM13 bit remains set to "1" while the FMR01 bit in the FMR0 register = 1 (CPU rewrite mode
enabled). The PM13 bit is reverted to its original value by clearing the FMR01 bit to "0" (CPU rewrite
mode disabled). However, if the PM13 bit is changed during CPU rewrite mode, its changed value is
not reflected until after the FMR01 bit is cleared to "0".
2. When in CPU rewrite mode, the PM10 and PM13 bits in the PM1 register are set to "1". The rewrite
control program can only be executed in the internal RAM or in an external area that is enabled for
use when the PM13 bit = 1. When the PM13 bit = 0 and the flash memory is used in 4-Mbyte mode,
the extended accessible area (40000h to BFFFFh) cannot be used.
R
e
. v
2
3 .
0
S
e
p
0
, 1
2
0
0
4
R
E
J
0
9
B
0
1
8
5
0 -
2
3
0
Z
(1)
(2)
page 243
f o
3
6
4
Standard Serial I/O Mode
The user ROM area is
rewritten using a dedicated
serial programmer.
Standard serial I/O mode 1:
Clock synchronous serial
I/O
Standard serial I/O mode 2:
UART
User ROM area
Boot mode
Serial programmer
22. Flash Memory Version
Parallel I/O Mode
The boot ROM area and
user ROM area is rewritten
using a dedicated parallel
programmer.
User ROM area
Boot ROM area
Parallel I/O mode
Parallel programmer
Advertisement
Table of Contents
