AT52SC1283J datasheet(11/52 Pages) ATMEL

11 / 52 page

3530B–STKD–2/4/05

AT52SC1283J/1284J [Preliminary]

Note:

1. A Command Sequence Error is indicated when SR1, SR3, SR4 and SR5 are set.

Table 6-3.

Status Register Bit Definition

WSMS

ESS

PRS

VPPS

PSS

SLS

PLS

765

43210

Notes

SR7 WRITE STATE MACHINE STATUS (WSMS)

1 = Ready

0 = Busy

Check Write State Machine bit first to determine Word Program

or Sector Erase completion, before checking program or erase

status bits.

SR6 = ERASE SUSPEND STATUS (ESS)

1 = Erase Suspended

0 = Erase In Progress/Completed

When Erase Suspend is issued, WSM halts execution and sets

both WSMS and ESS bits to “1” – ESS bit remains set to “1” until

an Erase Resume command is issued.

SR5 = ERASE STATUS (ES)

1 = Error in Sector Erase

0 = Successful Sector Erase

When this bit is set to “1”, WSM has applied the max number of

erase pulses to the sector and is still unable to verify successful

sector erasure.

SR4 = PROGRAM STATUS (PRS)

1 = Error in Programming

0 = Successful Programming

When this bit is set to “1”, WSM has attempted but failed to

program a word

SR3 = VPP STATUS (VPPS)

1 = VPP Low Detect, Operation Abort

0 = VPP OK

The VPP status bit does not provide continuous indication of VPP

level. The WSM interrogates V

PP level only after the Program or

Erase command sequences have been entered and informs the

system if VPP has not been switched on. The VPP is also checked

before the operation is verified by the WSM.

SR2 = PROGRAM SUSPEND STATUS (PSS)

1 = Program Suspended

0 = Program in Progress/Completed

When Program Suspend is issued, WSM halts execution and

sets both WSMS and PSS bits to “1”. PSS bit remains set to “1”

until a Program Resume command is issued.

SR1 = SECTOR LOCK STATUS

1 = Prog/Erase attempted on a locked sector; Operation aborted.

0 = No operation to locked sectors

If a Program or Erase operation is attempted to one of the locked

sectors, this bit is set by the WSM. The operation specified is

aborted and the device is returned to read status mode.

SR0 = Plane Status (PLS)

Indicates program or erase status of the addressed plane.

Table 6-4.

Status Register Device WSMS and Write Status Definition

WSMS

(SR7)

PLS

(SR0)

Description

The addressed plane is performing a program/erase operation.

A plane other than the one currently addressed is performing a program/erase operation.

No program/erase operation is in progress in any plane. Erase and Program suspend bits (SR6, SR2)

indicate whether other planes are suspended.

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