at49ll040 ATMEL Corporation, at49ll040 Datasheet - Page 13

• Manufacturer Part Number: at49ll040
• Description: 4-megabit Low-pin Count Flash Memory
• Manufacturer: ATMEL Corporation

Table 10. General-purpose Input Registers
Command Definitions in (Hex)
Notes:
3343A–FLASH–6/03
Bit
7:5
4
3
2
1
0
Command Sequence
Read Array/Reset
Main Sector Erase
(64-Kbyte Sector)
Parametric/Boot Sector Erase
(32-/16-/8-Kbyte Sector)
Byte Program
Product ID Entry
Read Status Register
Clear Status Register
1. X = Any valid address within the device.
2. The sector must be not be write locked when attempting sector erase or program operations. Attempts to issue a sector
3. SA = Sector address. Any byte address within a sector can be used to designate the sector address (see page 10).
4. If a main sector erase command is given to a parametric/boot sector, the entire 64K region SA10 - SA7 will be erased.
5. Either 40H or 10H is recognized as the program setup.
6. Following the Product ID Entry command, read operations access manufacture and device ID. See Table 11.
7. AID = Address used to read data for manufacture or device ID.
8. SRD = Data Read from status register.
erase or byte program to a write locked sector will fail.
(2)(5)
(6)
(2)(3)
Function
Reserved
GPI[4]
Reads status of general-purpose input pin (PLCC-30/TSOP-7)
GPI[3]
Reads status of general-purpose input pin (PLCC-3/TSOP-15)
GPI[2]
Reads status of general-purpose input pin (PLCC-4/TSOP-16)
GPI[1]
Reads status of general-purpose input pin (PLCC-5/TSOP-17)
GPI[0]
Reads status of general-purpose input pin (PLCC-6/TSOP-18)
(2)(3)(4)
Bus Cycles
1
2
2
2
2
2
1
Operation
Write
Write
Write
Write
Write
Write
Write
XXXX
XXXX
XXXX
XXXX
Addr
Addr
SA
SA
1st Bus Cycle
40 or 10
Data
FF
20
21
90
70
50
Operation
Read
Read
Write
Write
Write
AT49LL040
XXXX
AID
Addr
Addr
SA
SA
2nd Bus Cycle
(7)
SRD
Data
D
D
D0
D0
OUT
IN
(8)
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