LH28F008SAT-12 Sharp Electronics, LH28F008SAT-12 Datasheet - Page 14

• Manufacturer Part Number: LH28F008SAT-12
• Manufacturer: Sharp Electronics

Specifications of LH28F008SAT-12

• Cell Type: NOR
• Density: 8Mb
• Access Time (max): 120ns
• Interface Type: Parallel
• Boot Type: Not Required
• Address Bus: 20b
• Operating Supply Voltage (typ): 5V
• Operating Temp Range: 0C to 70C
• Package Type: TSOP
• Program/erase Volt (typ): 11.4 to 12.6V
• Sync/async: Asynchronous
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Word Size: 8b
• Number Of Words: 1M
• Supply Current: 50mA
• Mounting: Surface Mount
• Pin Count: 40
• Lead Free Status / Rohs Status: Not Compliant

LH28F008SA
14
FULL STATUS CHECK PROCEDURE
CHECK IF DESIRED
STATUS REGISTER
BLOCK ADDRESS
BLOCK ADDRESS
BLOCK ERASE
BLOCK ERASE
SUCCESSFUL
FULL STATUS
COMPLETED
DATA READ
WRITE D0H
WRITE 20H
(see above)
SR.4, 5 = 1
READY?
SR.3 = 0
SR.5 = 0
START
WSM
?
?
?
YES
YES
YES
NO
YES
NO
NO
NO
BLOCK ERASE
SUSPEND
NO
ERASE?
SEQUENCE
V
COMMAND
PP
ERROR
ERROR
ERROR
RANGE
ERASE SUSPEND
Figure 6. Automated Block Erase Flowchart
YES
LOOP
Repeat for subsequent bytes.
Full status check can be done after each block or after a
sequence of blocks.
Write FFH after the last block erase operation to reset the
device to Read Array Mode.
SR.3 must be cleared, if set during a block erase attempt,
before further attempts are allowed by the Write State
Machine.
SR.5 is only cleared by the Clear Status Register Command,
in cases where multiple blocks are erased before full status is
checked.
If error is detected, clear the Status Register before attempting
retry or other error recovery.
Standby/Read
OPERATION
OPERATION
Optional
Standby
Standby
Standby
Write
Write
Read
BUS
BUS
COMMAND
COMMAND
Erase
Setup
Erase
Data = 20H
Addr = Within block to be
erased
Data = D0H
Addr = Within block to be
erased
Check RY/BY
V
Read Status Register
Check SR.7
1 = Ready, 0 = Busy
Toggle OE or CE to update
Status Register
CPU may already have read
Status Register data in WSM
Ready polling above
Check SR.3
1 = V
Check SR.4, 5
Both 1 = Command Sequence
Error
Check SR.5
1 = Block Erase Error
OH
8M (1M × 8) Flash Memory
= Ready, V
PP
Low Detect
COMMENTS
COMMENTS
or
OL
= Busy
28F008SA-6