R8CSLASH15 datasheet(203/277 Pages) RENESAS

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R8C/14 Group, R8C/15 Group

18. Flash Memory Version

Rev.2.10

Jan 19, 2006

Page 191 of 253

REJ09B0164-0210

18. Flash Memory Version

18.1

Overview

In the flash memory version, rewrite operations to the flash memory can be performed in three modes

;

CPU rewrite, standard serial I/O, parallel I/O modes.

Table 18.1 lists the Flash Memory Version Performance (see Table 1.1 Performance Outline of the R8C/

14 Group and Table 1.2 Performance Outline of the R8C/15 Group for the items not listed on Table

18.1).

NOTES:

1. Definition of program and erase endurance.

The program and erase endurance is defined to be per-block. When the program and erase

endurance is n times (n=100 or 10,000 times), to erase n times per block is possible. For example, if

performing one-byte write to the distinct addresses on Block A of 1K-byte block 1,024 times and

then erasing that block, the program and erase endurance is counted as one time. If rewriting more

than 100 times, execute the program until the blank areas are all used to reduce the substantial

rewrite endurance and then erase. Do not rewrite only particular blocks and rewrite to average the

program and erase endurance to each block. Also keep the erase endurance as information and set

up the limit endurance.

2. Blocks A and B are embedded only in the R8C/15 group.

Table 18.1

Flash Memory Version Performance

Item

Specification

Flash Memory Operating Mode

3 modes (CPU rewrite, standard serial I/O, and parallel I/O mode)

Division of Erase Block

See Figure 18.1 and Figure 18.2

Program Method

Byte unit

Erase Method

Block erase

Program, Erase Control Method

Program and erase control by software command

Rewrite Control Method

Rewrite control for Block 0 and 1 by FMR02 bit in FMR0 register

Rewrite control for Block 0 by FMR16 bit and Block 1 by FMR16 bit

Number of Commands

5 commands

Program and

Erase

Endurance(1)

Block0 and 1

(Program ROM)

R8C/14 Group : 100 times ; R8C/15 Group : 1,000 times

BlockA and B

(Data flash)(2)

10,000 times

ID Code Check Function

Standard serial I/O mode supported

ROM Code Protect

For parallel I/O mode supported

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