M16C28 Datasheet, PDF (317/423 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/28 Group (M16C/28, M16C/28B)
18. Flash Memory Version
Table 18.2 Flash Memory Rewrite Modes Overview
Flash Memory CPU Rewrite Mode
Standard Serial I/O Mode
Parallel I/O Mode
Rewrite Mode
Function
Software command execu- A dedicated serial programer A dedicated parallel pro-
tion by CPU rewrites the user rewrites the user ROM area. grammer rewrites the user
ROM area.
Standard serial I/O mode 1: ROM area.
EW mode 0:
Clock synchronous serial
Rewritable in area other I/O
than flash memory
Standard serial I/O mode 2:
EW mode 1:
UART
Rewritable in flash memory
Areas 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
18.1.1 Boot Mode
The microcomputer 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 Jan. 31, 2007 ^{page 297} of 385
REJ09B0047-0200