LH28F800BJHE-PBTL90 View Datasheet(PDF) - Sharp Electronics

Part Name

Description

Manufacturer

LH28F800BJHE-PBTL90

8M (x8/x16) Flash Memory

Sharp Electronics 

LHF80J05

21

Start

Write 70H

Read Status

Register

0

SR.7=

1

Write 40H or 10H

Write Word/Byte

Data and Address

Read

Status Register

0

SR.7=

1

Full Status

Check if Desired

Word/Byte Write

Complete

No

Suspend

Word/Byte

Write

Suspend Word/Byte

Write Loop

Yes

FULL STATUS CHECK PROCEDURE

Read Status Register

Data(See Above)

1

SR.3=

0

VCCW Range Error

1

SR.1=

0

Device Protect Error

1

SR.4=

0

Word/Byte Write Successful

Word/Byte Write Error

Bus

Operation

Write

Read

Standby

Write

Write

Command

Comments

Read Status

Register

Data=70H

Addr=X

Status Register Data

Check SR.7

1=WSM Ready

0=WSM Busy

Setup Word/Byte Write

Data=40H or 10H

Addr=X

Word/Byte Write

Data=Data to Be Written

Addr=Location to Be Written

Read

Status Register Data

Standby

Check SR.7

1=WSM Ready

0=WSM Busy

Repeat for subsequent word/byte writes.

SR full status check can be done after each word/byte write, or after a sequence of

word/byte writes.

Write FFH after the last word/byte write operation to place device in read array mode.

Bus

Operation

Command

Comments

Standby

Standby

Check SR.3

1=VCCW Error Detect

Check SR.1

1=Device Protect Detect

Standby

Check SR.4

1=Data Write Error

SR.4, SR.3 and SR.1 are only cleared by the Clear Status Register command in cases

where multiple locations are written before full status is checked.

If error is detected, clear the Status Register before attempting retry or other error recovery.

Figure 8. Automated Word/Byte Write Flowchart

Rev. 1.27

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