7643 datasheet(93/121 Pages) RENESAS

93 / 121 page

Rev.2.00

Aug 28, 2006

page 93 of 119

7643 Group

REJ03B0054-0200

Symbol

Table 22 Definition of each bit in status register (SRD)

Status Register (SRD)

The status register shows the operating status of the flash

memory and whether erase operations and programs ended suc-

cessfully or in error. It can be read in the following ways:

(1) By reading an arbitrary address from the User ROM area after

writing the read status register command (7016)

(2) By reading an arbitrary address from the User ROM area in the

period from when the program starts or erase operation starts

to when the read array command (FF16) is input.

Also, the status register can be cleared by writing the clear status

After reset, the status register is set to “8016”.

Table 22 shows the status register. Each bit in this register is ex-

plained below.

•Sequencer status (SR7)

The sequencer status indicates the operating status of the flash

memory. This bit is set to “0” (busy) during write or erase operation

and is set to “1” when these operations ends.

After power-on, the sequencer status is set to “1” (ready).

•Erase status (SR5)

The erase status indicates the operating status of erase operation.

If an erase error occurs, it is set to “1”. When the erase status is

cleared, it is set to “0”.

•Program status (SR4)

The program status indicates the operating status of write opera-

tion. When a write error occurs, it is set to “1”.

The program status is set to “0” when it is cleared.

If “1” is written for any of the SR5 and SR4 bits, the program,

erase all blocks, and block erase commands are not accepted.

Before executing these commands, execute the clear status regis-

ter command (5016) and clear the status register.

Also, if any commands are not correct, both SR5 and SR4 are set

to “1”.

SR7 (bit7)

SR6 (bit6)

SR5 (bit5)

SR4 (bit4)

SR3 (bit3)

SR2 (bit2)

SR1 (bit1)

SR0 (bit0)

Definition

“1”

“0”

Status name

Sequencer status

Reserved

Erase status

Program status

Reserved

Ready

Terminated in error

Busy

Terminated normally

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