M16CSLASH26 datasheet(203/239 Pages) RENESAS

203 / 239 page

CPU Rewrite Mode (Flash Memory Version)

197

Renesas Technology Corp.

M16C/26 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Under

development

Preliminary Specifications Rev. 0.9

Specifications in this manual are tentative and subject to change.

Start

Write 4016

Program

completed

Write data to target

address

SR4=0?

Program

error

YES

Status register

read

YES

SR7=1?

RY/BY=1?

(Set an address to even address in the user

ROM area when reading the status register)

(Set an address to even address in the

user ROM area when write 4016 )

Figure 1.20.3. Program flowchart

Program Command (4016)

Program operation starts when the command code “4016” is written in the first bus cycle. Then, if the

address and data to program are written in the 2nd bus cycle, program operation (data programming

and verification) will start. Make an address in the first bus cycle same as an address to program by

the second bus cycle.

Whether the write operation is completed can be confirmed by reading the status register or the RY/

BY status flag. When the program starts, the read status register mode is accessed automatically and

the content of the status register is read into the data bus (D0 - D7). The status register bit 7 (SR7) is

set to 0 at the same time the write operation starts and is returned to 1 upon completion of the write

operation. In this case, the read status register mode remains active until the Read Array command

(FF16) is written.

The RY/BY status flag is 0 during write operation and 1 when the write operation is completed as is

the status register bit 7.

At program end, program results can be checked by reading the status register.

Figure 1.20.3 shows an example of a program flowchart.

Each block of the flash memory can be write protected by using a lock bit. For details, refer to the

section where the data protect function is detailed.

Additional writes to the already programmed pages are prohibited.

Do a command to use in right after of program command as follows

Make an address in the first bus cycle same as an address to program by the second bus cycle of

program command.

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