AT90LS4433-4AI datasheet(88/126 Pages) ATMEL

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AT90S/LS4433

1042H–AVR–04/03

Chip Erase

The Chip Erase command will erase the Flash and EEPROM memories and the Lock

bits. The Lock bits are not reset until the Flash and EEPROM have been completely

erased. The Fuse bits are not changed. Chip Erase must be performed before the Flash

or EEPROM is reprogrammed.

A: Load Command “Chip Erase”

Set XA1, XA0 to “10”. This enables command loading.

Set BS to “0”.

Set DATA to “1000 0000”. This is the command for Chip Erase.

Give XTAL1 a positive pulse. This loads the command.

Give WR a t

WLWH_CE wide negative pulse to execute Chip Erase. See Table 33 for

WLWH_CE value. Chip Erase does not generate any activity on the RDY/BSY pin.

Programming the Flash

A: Load Command “Write Flash”

Set XA1, XA0 to “10”. This enables command loading.

Set BS to “0”.

Set DATA to “0001 0000”. This is the command for Write Flash.

Give XTAL1 a positive pulse. This loads the command.

B: Load Address High Byte

Set XA1, XA0 to “00”. This enables address loading.

Set BS to “1”. This selects High Byte.

Set DATA = Address High Byte ($00 - $07).

Give XTAL1 a positive pulse. This loads the address High Byte.

C: Load Address Low Byte

Set XA1, XA0 to “00”. This enables address loading.

Set BS to “0”. This selects Low Byte.

Set DATA = Address Low Byte ($00 - $FF).

Give XTAL1 a positive pulse. This loads the address Low Byte.

D: Load Data Low Byte

Set XA1, XA0 to “01”. This enables data loading.

Set DATA = Data Low Byte ($00 - $FF).

Give XTAL1 a positive pulse. This loads the data Low Byte.

E: Write Data Low Byte

Set BS to “0”. This selects low data.

Give WR a negative pulse. This starts programming of the data byte. RDY/BSY

goes low.

Wait until RDY/BSY goes high to program the next byte.

(See Figure 63 for signal waveforms.)

F: Load Data High Byte

Set XA1, XA0 to “01”. This enables data loading.

Set DATA = Data High Byte ($00 - $FF).

Give XTAL1 a positive pulse. This loads the data High Byte.

AT90LS4433-4AI Datasheet(PDF) 88 Page - ATMEL Corporation

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