3850 datasheet(59/103 Pages) RENESAS

59 / 103 page

Rev.3.01

2003.06.20

page 57 of 98

3850 Group (Spec.H/A)

qErase All Blocks Command (2016/2016)

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

confirmation command code “2016” in the second bus cycle that

follows, the operation of erase all blocks (erase and erase verify)

starts.

Whether the erase all blocks command is terminated can be con-

____

firmed by reading the status register or the RY/BY Status Flag of

flash memory control register. When the erase all blocks operation

starts, the read status register mode is entered automatically and

the contents of the status register can be read out at the data bus

(D0 to D7). The status register bit 7 (SR7) is set to “0” at the same

time the erase operation starts and is returned to “1” upon comple-

tion of the erase operation. In this case, the read status register

mode remains active until another command is written.

____

The RY/BY Status Flag is “0” during erase operation and “1” when

the erase operation is completed as is the status register bit 7

(SR7).

After the erase all blocks end, erase results can be checked by

reading bit 5 (SRS) of the status register. For details, refer to the

section where the status register is detailed.

qBlock Erase Command (2016/D016)

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

confirmation command code “D016” and the blobk 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 reading the status register or the RY/BY Status Flag of flash

memory control register. At the same time the block erase opera-

tion starts, the read status register mode is automatically entered,

so that the contents of the status register can be read out. The

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

erase operation starts and is returned to “1” upon completion of

the block erase operation. In this case, the read status register

mode remains active until the read array command (FF16) is writ-

ten.

____

The RY/BY Status Flag is “0” during block erase operation and “1”

when the block erase operation is completed as is the status reg-

ister bit 7.

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

ing bit 5 (SRS) of the status register. For details, refer to the

section where the status register is detailed.

Fig. 61 Erase flowchart

Write 2016

2016/D016

Block address

Erase completed

(Read comand “FF16”

write)

YES

Start

Write

SR5 = 0 ?

Erase error

YES

2016:Erase all blocks command

D016:Block erase command

SR7 = 1 ?

RY/BY = 1 ?

Status register

read

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