at49lh004 ATMEL Corporation, at49lh004 Datasheet - Page 28

• Manufacturer Part Number: at49lh004
• Description: 4-megabit Firmware Hub And Low-pin Count Flash Memory
• Manufacturer: ATMEL Corporation

Table 16-1.
Note:
16.5
The Product ID Read mode is used to identify the product type and the manufacturer as Atmel. Following the Product ID
Read command, read cycles from the addresses shown in
exit the Product ID Read mode, any valid command can be written to the device.
Table 16-2.
28
Code
Manufacturer ID
Device ID
SR
Bit
3:2
7
6
5
4
1
0
1. SR[1] does not provide a continuous indication of the Write-Lock bit, TBL pin, or WP values. The WSM interrogates the
Product ID Read
Name
Write State Machine
Status (WSM)
Reserved
Erase Status
Program Status
Reserved
Device Protect
Status
Reserved
AT49LH004
Write-Lock bit, TBL pin, or WP pin only after a sector erase or program operation. Depending on the attempted operation, it
informs the system whether or not the selected sector is locked.
Status Register (SR)
Product ID Address and Data
(1)
Description
Reserved for future use.
Reserved for future use.
Reserved for future use.
0
1
0
1
0
1
0
1
Device is BUSY.
A program or erase cycle is in progress. SR[6-1] values are invalid when SR[7] is 0.
Device is READY.
The device is ready for any operation.
Erase successful.
The sector erase operation completed successfully.
Erase failed.
The sector erase operation failed. If SR[5,4] are 1, then there was a command
sequence error.
Program successful.
The byte program operation competed successfully.
Program failed.
The program operation failed. If SR[5,4] are 1, then there was a command sequence error.
Sector is unlocked.
The sector being erased or programmed is unlocked (not protected).
Sector is hardware write protected or write-locked.
The sector being erased or programmed is either hardware write protected by the TBL or
WP pin, or it is write-locked.
Address
000000H
000001H
Table 16-2
retrieve the manufacturer and device ID code. To
Data
EEH
1FH
3383D–FLASH–6/05