M16CSLASH1N datasheet(200/238 Pages) RENESAS

200 / 238 page

Rev.1.00

Oct 20, 2004

page 188 of 222

M16C/1N Group

19. Flash Memory Version

REJ09B0007-0100Z

19.5.4 Software Commands

Software commands are described below. The command code and data must be read and written in

16 bit units, to and from even addresses in the user ROM area. When writing command code, the 8

high-order bits (D15-D8) are ignored.

Table 19.4 shows the list of software commands.

Table 19.4 List of software commands

(1) Read array

This command reads the flash memory.

Writing 'xxFF16' in the first bus cycle places the microcomputer in read array mode. Enter the read

address in the next or subsequent bus cycles, and the content of the specified address can be read in

16 bit units.

Because the microcomputer remains in read array mode until another command is written, the con-

tents of multiple addresses can be read in succession.

(2) Read status register

This command reads the status register.

Write 'xx7016' in the first bus cycle, and the status register can be read in the second bus cycle (refer

to 19.5.5 Status Register). When reading the status register too, specify an even address in the user

ROM area.

Do not execute this command in EW1 mode.

(3) Clear status register

This command clears the status register to "0".

Write 'xx5016' in the first bus cycle, and the FMR0 register's FMR06 to FMR07 bits and the status

Software Command

Program

Clear status register

Read array

Read status register

First bus cycle

Second bus cycle

Block erase

Write

Mode

Read

Write

Mode

Address

SRD

xxD016

Data

(D15-D0)

xxFF16

xx7016

xx5016

xx4016

xx2016

Data

(D15-D0)

Address

SRD: Status register data (D7-D0)

WA: Write address (even address, however)

WD: Write data (16 bits)

BA: Uppermost block address (even address, however)

X: Any even address in the user ROM area

x: High-order 8 bits of command code (ignored)

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