LRS1338A View Datasheet(PDF) - Sharp Electronics
Part Name
Description
MFG CO.
'LRS1338A' PDF : 36 Pages View PDF
LRS1338A
Stacked Chip (8M Flash & 2M SRAM)
Table 8. Write Protection Alternatives
OPERATION
VPP
RP
VIL
X
VIL
Word Write or
Block Erase > VPPLK
VHH
VIH
WP
EFFECT
X All blocks locked
X All blocks locked
X All blocks unlocked
VIL Two boot blocks locked
VIH All blocks unlocked
Table 9. Status Register Definition
WSMS
ESS
ES
WWS
VPPS
WWSS
DPS
R
7
6
5
4
3
2
1
0
SR.7 = Write State Machine Status (WSMS)
1 = Ready
0 = Busy
SR.6 = Erase Suspend Status (ESS)
1 = Block Erase Suspended
0 = Block Erase in Progress/Completed
SR.5 = Erase(s)
1 = Error in Block Erasure
0 = Successful Block Erase
SR.4 = Word Write (WWS)
1 = Error in Word Write
0 = Successful Word Write
SR.3 = VPP Status (VPPS)
1 = VPP LOW Detect, Operation Abort
0 = VPP Okay
SR.2 = Word Write Suspend Status (WWSS)
1 = Word Write Suspended
0 = Word Write in Progress/Completed
SR.1 = Device Protect Status (DPS)
1 = WP and/or RP Lock Detected, Operation Abort
0 = Unlock
SR.0 = Reserved for future enhancements (R)
NOTES:
1. Check SR.7 to determine block erase or word write completion.
SR.6 - SR.0 are invalid while SR.7 = 0.
2. If both SR.5 and SR.4 are ‘1’s after a block erase attempt, an
improper command sequence was entered.
3. SR.3 does not provide a continuous indication of VPP level. The
WSM interrogates and indicates the VPP level only after Block
Erase or Word Write command sequences. SR.3 is not guaran-
teed to report accurate feedback only when VPP ≠ VPPH.
4. The WSM interrogates the WP and RP only after Block Erase or
Word Write command sequences. It informs the system, depending
on the attempted operation, if the WP is not VIH or RP is not VHH.
5. SR.0 is reserved for future use and should be masked out when
polling the status register.
18
Data Sheet
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