AT49BV160C 查看數據表（PDF） - Atmel Corporation

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AT49BV160C

16-megabit (1M x 16) 3-volt Only Flash Memory

Atmel Corporation 

CLEAR STATUS REGISTER: The WSM can set status register bits 1 through 7 and can clear

bits 2, 6 and 7; but, the WSM cannot clear status register bits 1, 3, 4 or 5. Because bits 1, 3, 4

and 5 indicate various error conditions, these bits can be cleared only through the Clear Status

Register command. By allowing the system software to control the resetting of these bits, sev-

eral operations may be performed (such as cumulatively programming several addresses or

erasing multiple sectors in sequence) before reading the status register to determine if an

error occurred during those operations. The status register should be cleared before beginning

another operation. The Read command must be issued before data can be read from the

memory array. The status register can also be cleared by resetting the device.

FLEXIBLE SECTOR PROTECTION: The AT49BV160C(T) offers two sector protection

modes, the Softlock and the Hardlock. The Softlock mode is optimized as sector protection for

sectors whose content changes frequently. The Hardlock protection mode is recommended

for sectors whose content changes infrequently. Once either of these two modes is enabled,

the contents of the selected sector is read-only and cannot be erased or programmed. Each

sector can be independently programmed for either the Softlock or Hardlock sector protection

mode. At power-up and reset, all sectors have their Softlock protection mode enabled.

SOFTLOCK AND UNLOCK: The Softlock protection mode can be disabled by issuing a two-

bus cycle Unlock command to the selected sector. Once a sector is unlocked, its contents can

be erased or programmed. To enable the Softlock protection mode, a two-bus cycle Softlock

command must be issued to the selected sector.

HARDLOCK AND WRITE PROTECT: The Hardlock sector protection mode operates in con-

junction with the Write Protect (WP) pin. The Hardlock sector protection mode can be enabled

by issuing a two-bus cycle Hardlock Software command to the selected sector. The state of

the Write Protect pin affects whether the Hardlock protection mode can be overridden.

• When the WP pin is low and the Hardlock protection mode is enabled, the sector cannot

be unlocked and the contents of the sector is read-only.

• When the WP pin is high, the Hardlock protection mode is overridden and the sector can

be unlocked via the Unlock command.

To disable the Hardlock sector protection mode, the chip must be either reset or power cycled.

6 AT49BV160C(T)

3367D–FLASH–5/04

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