M30620FCAFP datasheet(224/274 Pages) MITSUBISHI

224 / 274 page

CPU Rewrite Mode (Flash Memory Version)

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

224

Command

Page program

Clear status register

Read array

Read status register

(Note 3)

First bus cycle

Second bus cycle

Third bus cycle

FF16

7016

5016

4116

Write

XSRD

Read

Write

Lock bit program

7716

Write

D016

Write

Erase all unlock block

A716

Write

D016

Write

WA1

WD1

Write

(Note 2)

WA0(Note 3) WD0 (Note 3)

Block erase

2016

Write

D016

Write

BA (Note 4)

Read lock bit status

7116

Write

Read

(Note 5)

Mode

Address

Mode

Address

Mode

Address

Data

(D0 to D7)

Data

(D0 to D7)

Data

(D0 to D7)

(Note 6)

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

Note 3: WA = Write Address, WD = Write Data

WA and WD must be set sequentially from 0016 to FE16 (byte address; however, an even address). The page size is

256 bytes.

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

Note 5: D6 corresponds to the block lock status. Block not locked when D6 = 1, block locked when D6 = 0.

Note 6: X denotes a given address in the user ROM area (that is an even address).

Software Commands

Table 1.26.1 lists the software commands available with the M16C/62A (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.

Table 1.26.1. List of software commands (CPU rewrite mode)

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.

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 SR3 to 5 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.

M30620FCAFP Datasheet(PDF) 224 Page - Mitsubishi Electric Semiconductor

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