AT49LH002-33JC Atmel, AT49LH002-33JC Datasheet - Page 17

• Manufacturer Part Number: AT49LH002-33JC
• Description: IC FLASH 2MBIT 33MHZ 32PLCC
• Manufacturer: Atmel

Specifications of AT49LH002-33JC

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 2M (256K x 8)
• Speed: 33MHz
• Interface: Parallel
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 32-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Table 10. Hardware Write Protection Options
Register-Based
Sector Locking
3377B–FLASH–9/03
Sector
6
5
4
3
2
1
0
(Bytes)
Size
16K
32K
64K
64K
64K
8K
8K
03C000H - 03FFFFH
03A000H - 03BFFFH
The TBL and WP pins must be set to the desired protection state prior to starting a program or
erase operation because they are sampled at the beginning of the operation. Changing the
state of TBL or WP during a program or erase operation may cause unpredictable results. The
new lock status will take place after the program or erase operation completes.
The TBL and WP pins function independently from the Sector Locking Registers. These pins,
when active, will write protect the appropriate sector(s) against program and erase operations
regardless of the values of the Sector Locking Registers. For example, when TBL is active,
writing to the top sector is prevented regardless of the state of the Write-Lock bit for the top
sector’s locking register. In such a case, clearing the Write-Lock bit in the Sector Locking Reg-
ister will have no functional effect even though the register may indicate that the sector is no
longer locked. However, the register may still be set to Read-Lock the sector if desired.
For protecting the sectors of the memory array, the TBL and WP pins always take precedence
over the Sector Locking Registers. In addition, the states of the TBL and WP pins have no
effect on the values or status of the Sector Locking Registers.
The device has seven Sector Locking Registers that are used in lieu of or in conjunction with
the TBL and WP pins to control the lock protection for each sector in the memory array. The
Sector Locking Registers are accessed through their respective address locations (detailed in
Table 11) in the 4 GB system memory map. Since the address bit used to distinguish between
memory and register accesses differs when the device is used as a FWH or LPC Flash (A22
for FWH and A23 for LPC), the register memory address will also differ.
The Sector Locking Registers are both readable and writable, and each register has three
dedicated locking bits to control Read Lock, Write Lock, and Lock Down functions. Therefore,
a Sector Locking Register can be read to determine what its current value is set to (e.g., set to
Lock Down status). Reading the Sector Locking Registers, however, will not determine the
status of the TBL and WP pins.
When returning from a reset condition or after power-up, the Sector Locking Registers will
always default to a state of 01H.
030000H - 037FFFH
020000H - 02FFFFH
010000H - 01FFFFH
000000H - 00FFFFH
038000H - 039FFFH
Address Range
For the Following Commands:
Byte Program (40H or 10H)
Sector Erase (21H)
TBL
WP
WP
WP
WP
WP
WP
Hardware Write Protection
For the Following Command:
Uniform Sector Erase (20H)
AT49LH002
TBL
TBL
TBL
TBL
WP
WP
WP
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