M32CSLASH8B datasheet(324/406 Pages) RENESAS

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M32C/8B Group

23. Flash Memory

Preliminary specification

Specifications in this manual are tentative and subject to change.

REJ09B0450-0050 Rev.0.50 Oct 31, 2008

Page 307 of 385

23.5

Boot Mode

Use the following procedure to enter boot mode and a program in the boot ROM area is executed.

(1) Apply an “L” (pull-down) to the P6_5 pin or apply an “H” (pull-up) to the P6_7 pin

(2) Apply an “L” (pull-down) to the EPM (P5_5) pin and apply an “H” (pull-up) to the CE (P5_0) pin

(3) Apply an “H” to the CNVSS pin

(4) Perform a hardware reset

When switching from the boot ROM area to the user ROM area, set the FMR05 bit in the FMR0 register to 1

(access the user ROM area) by the program placed in the area other than the flash memory.

The rewrite control program for standard serial I/O mode is stored in the boot ROM area in the factory default

configuration. Do not rewrite the boot ROM area.

23.6

Flash Memory Rewrite Mode

CPU rewrite mode, standard serial I/O mode, and parallel I/O mode can be used to erase and program the flash

memory. Table 23.3 lists overview of flash memory rewrite mode.

Table 23.3

Flash Memory Rewrite Mode Overview

NOTE:

1. In parallel I/O mode, the boot ROM area can be programmed. However, do not rewrite the boot ROM area

since the rewrite control program for standard serial I/O mode is stored in the boot ROM area in the factory

default configuration.

Flash Memory

Rewrite Mode

CPU Rewrite Mode

Standard Serial I/O Mode

Parallel I/O Mode(1)

Function

User ROM area is programmed

by the CPU writing software

commands.

EW0 mode:

Execute the rewrite control

program placed in an area

other than the flash memory.

EW1 mode:

Execute the rewrite control

program placed in the flash

memory.

User ROM area is programmed

using a dedicated serial

programmer.

Standard serial I/O mode 1:

Clock synchronous mode in

UART1

Standard serial I/O mode 2:

Clock asynchronous mode

in UART1

User ROM area is programmed

using a dedicated parallel

programmer.

Rewritable area

User ROM area

Operating mode

Single-chip mode

Memory expansion mode

(EW0 mode)

Boot mode

Parallel I/O mode

ROM programmer

−

Serial programmer

Parallel programmer

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