11LC080 datasheet(16/48 Pages) MICROCHIP

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11XX

DS22067J-page 16

 2011 Microchip Technology Inc.

4.7

Erase All (ERAL) Instruction

The ERAL instruction allows the user to write ‘0x00’ to

the entire memory array with one command. Note that

the write enable latch (WEL) must first be set by issuing

the WREN instruction.

Once the write enable latch is set, the user may pro-

ceed with issuing a ERAL instruction (including the

header and device address bytes). Immediately after

the NoMAK bit has been transmitted by the master, the

internal write cycle is initiated, during which time all

words of the memory array are written to ‘0x00’.

The ERAL instruction is ignored if either of the Block

Protect bits (BP0, BP1) are not 0, meaning 1/4, 1/2, or

all of the array is protected.

FIGURE 4-8:

ERASE ALL COMMAND SEQUENCE

4.8

Set All (SETAL) Instruction

The SETAL instruction allows the user to write ‘0xFF’

to the entire memory array with one command. Note

that the write enable latch (WEL) must first be set by

issuing the WREN instruction.

Once the write enable latch is set, the user may pro-

ceed with issuing a SETAL instruction (including the

header and device address bytes). Immediately after

the NoMAK bit has been transmitted by the master, the

internal write cycle is initiated, during which time all

words of the memory array are written to ‘0xFF’.

The SETAL instruction is ignored if either of the Block

Protect bits (BP0, BP1) are not 0, meaning 1/4, 1/2, or

all of the array is protected.

FIGURE 4-9:

SET ALL COMMAND SEQUENCE

Note: The ERAL instruction must be termi-

nated with a NoMAK following the com-

mand byte. If a NoMAK is not received

at this point, the command will be con-

sidered invalid, and the device will go

into Idle mode without responding with a

SAK or executing the command.

Start Header

SCIO

Device Address

(1)

Command

Standby Pulse

SCIO

Twc

Note 1: For the 11XXXX1, this bit must be a ‘1’.

Note: The SETAL instruction must be termi-

nated with a NoMAK following the com-

mand byte. If a NoMAK is not received

at this point, the command will be con-

sidered invalid, and the device will go

into Idle mode without responding with a

SAK or executing the command.

Start Header

SCIO

Device Address

(1)

Command

Standby Pulse

SCIO

Twc

Note 1: For the 11XXXX1, this bit must be a ‘1’.

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