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Rev.1.02 Jul 01, 2005 page 261 of 314
REJ09B0126-0102
M16C/6N Group (M16C/6NL, M16C/6NN) 20. Flash Memory Version
Under development
This document is under development and its contents are subject to change.
20.5 Parallel I/O Mode
In parallel I/O mode, the user ROM area and the boot ROM area can be rewritten by a parallel programmer
supporting the M16C/6N Group (M16C/6NL, M16C/6NN). Contact your parallel programmer manufacturer
for more information on the parallel programmer. Refer to the user's manual included with your parallel
programmer for instructions.
20.5.1 User ROM and Boot ROM Areas
An erase block operation in the boot ROM area is applied to only one 4-Kbyte block. The rewrite control
program in standard serial I/O and CAN I/O modes are written in the boot ROM area before shipment. Do
not rewrite the boot ROM area if using the serial programmer.
In parallel I/O mode, the boot ROM area is located in addresses 0FF000h to 0FFFFFh. Rewrite this
address range only if rewriting the boot ROM area. (Do not access addresses other than addresses
0FF000h to 0FFFFFh.)
20.5.2 ROM Code Protect Function
The ROM code protect function prevents the flash memory from being read and rewritten in parallel I/O
mode. (Refer to 20.2 Functions to Prevent Flash Memory from Rewriting.)