R8CSLASH13 datasheet(176/224 Pages) RENESAS

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R8C/13 Group

17. Memory Map

Rev.1.20

Jan 27, 2006

page 165 of 205

REJ09B0111-0120

Table 17.1 Flash Memory Version Performance

17. Flash Memory Version

17.1 Overview

The flash memory version has two modes—CPU rewrite and standard serial I/O—in which its flash

memory can be operated on.

Table 17.1 outlines the performance of flash memory version (see “Table 1.1 Performance” for the items

not listed on Table 17.1).

Item

Flash memory operating mode

Erase block

Method for program

Method for erasure

Program, erase control method

Protect method

Number of commands

Number of program

and erasure(1)

ROM code protection

Specification

2 modes (CPU rewrite and standard serial I/O)

See “Figure 17.1. Flash Memory Block Diagram”

In units of byte

Block erase

Program and erase controlled by software command

Protect for Block 0 and 1 by FMR02 bit in FMR0 register

5 commands

1,000 times

Standard serial I/O mode is supported.

NOTES:

1: Definition of program/erase times

The program/erase times are defined to be per-block erase times. When the program/erase times

are n times (n=1,000 or 10,000 times), to erase n times per block is possible. For example, if

performing one-byte write to the distinct addresses on the Block A of 2K-byte block 2,048 times and

then erasing that block, the number of the program/erase cycles is one time. if rewriting more than

1,000 times, run the program until the vacant areas are all used to reduce the substantial rewrite

times and then erase. Avoid rewriting only particular blocks and rewrite to average the program and

erase times to each block. Also keep the erase times as inrformation and set up the limit times.

Block0 and 1 (program ROM)

10,000 times

BlockA and B (data flash)

Protect for Block 0 by FMR16 bit and Block 1 by FMR16 bit

Table 17.2 Flash Memory Rewrite Modes

Flash memory

CPU rewrite mode

Standard serial I/O mode

rewrite mode

Function

Areas which

User ROM area

can be rewritten

Operation

Single chip mode

Boot mode

mode

ROM

None

Serial programmer

programmer

User ROM area is rewritten by executing

software commands from the CPU.

EW0 mode: Can be rewritten in any area

other than the flash memory

EW1 mode: Can be rewritten in the flash

memory

User ROM area is rewritten by using a

dedicated serial programmer.

Standard serial I/O mode 1

: Clock synchronous serial I/O

Standard serial I/O mode 2

: UART

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