38D2 datasheet(76/136 Pages) RENESAS

76 / 136 page

Rev.3.02

Apr 10, 2008

Page 76 of 131

REJ03B0177-0302

38D2 Group

Software Commands

Table 17 lists the software commands.

After setting the CPU rewrite mode select bit to “1”, execute a

software command to specify an erase or program operation.

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 one of the bus cycles that follow, the contents of the specified

address are read out at the data bus (D0 to D7).

The read array mode is retained until another command is

written.

• Read Status Register Command (7016)

When the command code “7016” is written in the first bus cycle,

the contents of the status register are read out at the data bus (D0

to 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 SR4 and SR5 of the status

operation has ended in an error. To use this command, write the

command code “5016” in the first bus cycle.

• 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.

Whether the write operation is completed can be confirmed by

read status register or the RY/BY status flag. To read the status

status register bit 7 (SR7) is set to “0” at the same time the

program starts and returned to “1” upon completion of the

program. The read status mode remains active until the read

array command (“FF16”) is written.

The RY/BY status flag is set to “0” during program operation

and “1” when the program operation is completed as is the status

At program end, program results can be checked by reading the

status register.

Fig 75. Program flowchart

NOTES:

1. SRD = Status Register Data

2. WA = Write Address, WD = Write Data

3. BA = Block Address to be erased (Input the maximum address of each block.)

4. X denotes a given address in the User ROM area.

Start

Write “4016”

SR7 =

“1”?

RY/BY =

“1”?

Read status register

Program completed

YES

Write

Write address

Write data

SR4 = “0”?

Program error

YES

Table 17 List of software commands (CPU rewrite mode)

Command

cycle

number

First bus cycle

Second bus cycle

Mode

Address

Data

(D0 to D7)

Mode

Address

Data

(D0 to D7)

Read array

Write

X(4)

FF16

Read status register

Write

7016

Read

SRD(1)

Clear status register

Write

5016

Program

Write

4016

Write

WA(2)

WD(2)

Block erase

Write

2016

Write

BA(3)

D016

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