M3885 datasheet(83/103 Pages) RENESAS

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3885 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS

Software Commands

Table 23 lists the software commands.

After setting the CPU reprogram mode select bit to “1”, write a soft-

ware command to specify an erase or program operation.

The content of each software command is explained below.

Read Array Command (FF16)

The read array mode is entered by writing the command code “FF16”

in the first bus cycle. When an address to be read is input in next bus

cycles, the content of the specified address is read out at the data

bus (D0–D7).

The read array mode is retained intact until another command is writ-

ten. And after power on and after recover from deep power down

mode, this mode is selected also.

Table 23 List of software commands (CPU rewrite mode)

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.

The status register is explained in the next section.

Clear Status Register Command (5016)

This command is used to clear the bits SR1,SR4 and SR5 of the

status register after they have been set. These bits indicate that op-

eration has ended in an error. To use this command, write the com-

mand code “5016” in the first bus cycle.

Command

Program

Clear status register

Read array

Read status register

First bus cycle

Second bus cycle

FF16

7016

5016

4016

Write

XSRD

Read

Write

(Note 1)

WA (Note 2) WD (Note 2)

Block erase

2016

Write

D016

WriteBA (Note 3)

ModeAddress

Mode

Address

Data

(D0 to D7)

Data

(D0 to D7)

(Note 4)

Note 1: SRD = Status Register Data

2: WA = Write Address, WD = Write Data

3: BA = Block Address (Enter the maximum address of each block.)

4: X denotes a given address in the user ROM area .

Cycle number

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