AT49BV320C ATMEL Corporation, AT49BV320C Datasheet - Page 14

• Manufacturer Part Number: AT49BV320C
• Description: 32-megabit (2M x 16) 3-volt Only Flash Memory
• Manufacturer: ATMEL Corporation

Protection Register Programming
Flowchart
Full Status Check Flowchart
14
AT49BV320C(T)
Register Data
Read Status
Successful
SR3, SR4
SR3, SR4
SR3, SR4
Program
Address & Data
Read Status
PR Address
(If Desired)
0
0
Full Status
Complete
Write C0,
0
Write PR
Program
Register
Check
SR7 =
Start
=
=
=
1
1
1
1
0
(Program Setup)
(Confirm Data)
Register Locked;
Program Aborted
V
Program Error
P P
Range Error
Protection Register Programming Procedure
Full Status Check Procedure
Program Protection Register operation addresses must be within the
protection register address space. Addresses outside this space will
return an error.
Repeat for subsequent programming operations.
Full status register check can be done after each program, or after a
sequence of program operations.
Write FF after the last operation to return to the Read mode.
SR3 must be cleared before the Write State Machine allows further
program attempts.
Only the Clear Status Register command clears SR1, SR3, SR4.
If an error is detected, clear the status register before attempting a
program retry or other error recovery.
Operation
Operation
Read
Write
Write
Bus
Bus
Idle
Idle
Idle
Idle
Command
Command
Protection
PR Setup
Program
Program
None
None
None
None
None
Comments
Data = C0
Addr = First Location to Program
Data = Data to Program
Addr = Location to Program
Status register data: Toggle CE or
OE to update status register data
Check SR7
1 = WSM Ready
0 = WSM Busy
Comments
Check SR1, SR3, SR4:
0,1,1 = V
Check SR1, SR3, SR4:
0,0,1 = Programming Error
Check SR1, SR3, SR4:
1, 0,1 = Sector locked; operation
aborted
PP
Range Error
3372D–FLASH–5/04