Renesas M16C/29 Series

20. Flash Memory Version
puorG92/C61M
page 331
854fo7002,03.raM21.1.veR
2110-1010B90JER
Table 20.2. Flash Memory Rewrite Modes Overview
Flash memory CPU rewrite mode Standard serial I/O Parallel I/O mode CAN I/O mode
rewrite mode mode
Function The user ROM area is The user ROM area The user ROM areas The user ROM areas is
rewritten when the CPU is rewritten using a are rewritten using a rewritten using a
excutes software dedicated serial dedicated parallel dedicated CAN pro-
command programmer. programmer. grammer.
from the CPU. Standard serial I/O
EW0 mode: mode 1:
Rewrite in area other Clock synchronous
than flash memory serial I/O
EW1 mode: Standard serial I/O
Rewrite in flash mode 2:
memory UART
Areas which User ROM area User ROM area User ROM area User ROM area
can be rewritten
Operation Single chip mode Boot mode Parallel I/O mode Boot mode
mode
ROM None Serial programmer Parallel programmer CAN programmer
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 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.