CAT25640LI-G【PDF 7/19 页】IC EEPROM 64KBIT 10MHZ 8DIP

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CAT25640

Status Register

The Status Register, as shown in Table 10, contains a

number of status and control bits.

The RDY (Ready) bit indicates whether the device is busy

with a write operation. This bit is automatically set to 1 during

an internal write cycle, and reset to 0 when the device is ready

to accept commands. For the host, this bit is read only.

The WEL (Write Enable Latch) bit is set/reset by the

WREN/WRDI commands. When set to 1, the device is in a

Write Enable state and when set to 0, the device is in a Write

Disable state.

The BP0 and BP1 (Block Protect) bits determine which

blocks are currently write protected. They are set by the user

with the WRSR command and are non ? volatile. The user is

Table 10. STATUS REGISTER

allowed to protect a quarter, one half or the entire memory,

by setting these bits according to Table 11. The protected

blocks then become read ? only.

The WPEN (Write Protect Enable) bit acts as an enable for

the WP pin. Hardware write protection is enabled when the

WP pin is low and the WPEN bit is 1. This condition

prevents writing to the status register and to the block

protected sections of memory. While hardware write

protection is active, only the non ? block protected memory

can be written. Hardware write protection is disabled when

the WP pin is high or the WPEN bit is 0. The WPEN bit, WP

pin and WEL bit combine to either permit or inhibit Write

operations, as detailed in Table 12.

7

WPEN

6

0

5

0

4

0

3

BP1

2

BP0

1

WEL

0

RDY

Table 11. BLOCK PROTECTION BITS

Status Register Bits

BP1

0

0

1

1

BP0

0

1

0

1

Array Address Protected

None

1800 ? 1FFF

1000 ? 1FFF

0000 ? 1FFF

Protection

No Protection

Quarter Array Protection

Half Array Protection

Full Array Protection

Table 12. WRITE PROTECT CONDITIONS

WPEN

0

0

1

1

X

X

WP

X

X

Low

Low

High

High

WEL

0

1

0

1

0

1

Protected Blocks

Protected

Protected

Protected

Protected

Protected

Protected

Unprotected Blocks

Protected

Writable

Protected

Writable

Protected

Writable

Status Register

Protected

Writable

Protected

Protected

Protected

Writable

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