38D2 datasheet(77/136 Pages) RENESAS

77 / 136 page

Rev.3.02

Apr 10, 2008

Page 77 of 131

REJ03B0177-0302

38D2 Group

• Block Erase Command (2016/D016)

By writing the command code “2016” in the first bus cycle and

the confirmation command code “D016” and the block address in

the second bus cycle that follows, the block erase (erase and

erase verify) operation starts for the block address of the flash

memory to be specified.

Whether the block erase operation is completed can be confirmed

by read status register or the RY/BY status flag of flash memory

control register. To read the status register, write the status

“0” at the same time the block erase operation starts and returned

to “1” upon completion of the block erase operation. The read

status mode at this time remains active until the read array

command (“FF16”) is written.

The RY/BY status flag register is set to “0” during block erase

operation and “1” when the block erase operation is completed as

is the status register bit 7 (SR7).

After the block erase ends, erase results can be checked by

reading the status register. For details, refer to the section where

the status register is detailed.

Fig 76. Erase flowchart

Write “2016”

Write “D016”

Block address

Read status register

SR7 =

“1”?

RY/BY =

“1”?

Erase completed

(write read command “FF16”)

YES

Start

SR5 = “0”?

Erase error

YES

38D2 Datasheet(PDF) 77 Page - Renesas Technology Corp