11AA02UID-ISLASHSN datasheet(15/32 Pages) MICROCHIP

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DS20005206A-page 15

11AA02UID

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 terminated

with a NoMAK following the command

byte. If a NoMAK is not received at this

point, the command will be considered

invalid, and the device will go into Idle

mode without responding with a SAK or

executing the command.

Start Header

SCIO

Device Address

Command

Standby Pulse

SCIO

Twc

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 consid-

ered invalid, and the device will go into

Idle mode without responding with a SAK

or executing the command.

Start Header

SCIO

Device Address

Command

Standby Pulse

SCIO

Twc

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