M16C26A Datasheet, PDF (248/352 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/26A Group (M16C/26A, M16C/26B, M16C/26T)
17. Flash Memory Version
Table 17.2. Flash Memory Rewrite Modes Overview
Flash memory
CPU rewrite mode
Standard serial I/O mode
Parallel I/O mode
rewrite mode
Function
The user ROM area is rewrit- The user ROM area is rewrit- The user ROM area is rewrit-
ten when the CPU executes ten using a dedicated serial ten using a dedicated paral-
software command
programmer.
lel programmer
EW0 mode:
Standard serial I/O mode 1:
Rewrite in area other than Clock synchronous serial
flash memory
I/O
EW1 mode:
Standard serial I/O mode 2:
Rewrite in flash memory
UART
Area which User ROM area
can be rewritten
Operation Single chip mode
mode
User ROM area
Boot mode
User ROM area
Parallel I/O mode
ROM
None
programmer
Serial programmer
Parallel programmer
17.1.1 Boot Mode
The MCU enters boot mode when a hardware reset is performed while a high-level ("H") signal is applied
to pins CNVSS and P86 or while an "H" signal is applied to pins CNVSS and P16 and a low-level ("L")
signal is applied to the P85. A program in the boot ROM area is executed.
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.
Rev. 2.00 Feb.15, 2007 ^{page 231} of 329
REJ09B0202-0200