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M
1
6
C
2 /
9
G
o r
u
p
Table 20.2. Flash Memory Rewrite Modes Overview
Flash memory
CPU rewrite mode
rewrite mode
Function
The user ROM area is
rewritten when the CPU is rewritten using a
excutes software
command
from the CPU.
EW0 mode:
Rewrite in area other
than flash memory
EW1 mode:
Rewrite in flash
memory
Areas which
User ROM area
can be rewritten
Operation
Single chip mode
mode
ROM
None
programmer
20.1.1 Boot Mode
The MCU enters boot mode when a hardware reset is performed while a high-level ("H") signal is applied
to pins CNV
and P8
SS
signal is applied to the P8
The boot ROM area is reserved. The boot ROM area stores the rewrite control program for a standard
serial I/O mode before shipping. Do not rewrite the boot ROM area.
R
e
. v
1
1 .
2
M
r a
3 .
, 0
2
0
0
7
R
E
J
0
9
B
0
1
0
1
0 -
1
1
2
Standard serial I/O
The user ROM area
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
or while an "H" signal is applied to pins CNV
6
. A program in the boot ROM area is executed.
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8
Parallel I/O mode
mode
The user ROM areas
are rewritten using a
dedicated parallel
programmer.
User ROM area
Parallel I/O mode
Parallel programmer
20. Flash Memory Version
CAN I/O mode
The user ROM areas is
rewritten using a
dedicated CAN pro-
grammer.
User ROM area
Boot mode
CAN programmer
and P1
and a low-level ("L")
SS
6
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