M16CSLASH26 datasheet(202/239 Pages) RENESAS

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Renesas Technology Corp.

CPU Rewrite Mode (Flash Memory Version)

196

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.

Software Commands

Table 1.20.1 lists the software commands available with the M16C/26 (flash memory version).

After setting the CPU rewrite mode select bit to 1, write a software command to specify an erase or

program operation. Note that when entering a software command, the upper byte (D8 to D15) is ignored.

The content of each software command is explained below.

The first bus cycle commands must be written to an even address in the user ROM area.

Read Array Command (FF16)

The read array mode is entered by writing the command code “FF16” in the first bus cycle. When an

even address to be read is input in one of the bus cycles that follow, the content of the specified

address is read out at the data bus (D0–D15), 16 bits at a time.

The read array mode is retained intact until another command is written.

However, please begin to read data in the following procedures when a user uses read array com-

mand after program command.

(1) Set FF16, FF16, FF16, FF16 to arbitrary continuing four address beforehand

(2) Input the top address which FF16 was set at (in read array mode)

(3) Input the top address till FFFF16 agrees with the value that begins to have been read

(4) Input top address +2

(5) Input top address +2 till FFFF16 agrees with the value that begins to have been read

(6) Input an arbitrary address

Read Status Register Command (7016)

When the command code “7016” is written in the first bus cycle, the content of the status register is

read out at the data bus (D0–D7) by a read in the second bus cycle (Set an address to even address

in the user ROM area).

The status register is explained in the next section.

In EW1 mode, cannot use read status register command.

Clear Status Register Command (5016)

This command is used to clear the bits SR4 and SR5 of the status register after they have been set.

These bits indicate that operation has ended in an error. To use this command, write the command

code “5016” in the first bus cycle.

Table 1.20.1. List of software commands (CPU rewrite mode)

Command

Program

Clear status register

Read array

Read status register

(Note 3)

First bus cycle

econd bus cycle

Block erase

Write

Mode

Read

Write

Mode

WA (Note 3)

BA (Note 4)

Address

SRD (Note 2)

WD (Note 3)

D016

Data

(D0 to D7)

FF16

7016

5016

4016

2016

Data

(D0 to D7)

Address

Note 1: When a software command is input, the high-order byte of data (D8 to D15) is ignored.

Note 2: SRD = Status Register Data (Set an address to even address in the user ROM area)

Note 3: WA = Write Address (even address), WD = Write Data (16-bit data)

Note 4: BA = Block Address (Enter the maximum address of each block that is an even address.)

Note 5: X denotes a given address in the user ROM area (that is an even address).

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