AT90LS4433-4AI datasheet(90/126 Pages) ATMEL

90 / 126 page

AT90S/LS4433

1042H–AVR–04/03

Figure 64. Programming the Flash Waveforms (Continued)

Reading the Flash

The algorithm for reading the Flash memory is as follows (refer to “Programming the

Flash” for details on command and address loading):

A: Load Command “0000 0010”.

B: Load Address High Byte ($00 - $07).

C: Load Address Low Byte ($00 - $FF).

Set OE to “0”, and BS to “0”. The Flash word Low Byte can now be read at

DATA.

Set BS to “1”. The Flash word High Byte can now be read from DATA.

Set OE to “1”.

Programming the EEPROM

The programming algorithm for the EEPROM Data memory is as follows (refer to “Pro-

gramming the Flash” for details on command, address and data loading):

A: Load Command “0001 0001”.

B: Load Address Low Byte ($00 - $FF).

C: Load Data Low Byte ($00 - $FF).

D: Write Data Low Byte.

Reading the EEPROM

The algorithm for reading the EEPROM memory is as follows (refer to “Programming the

Flash” for details on command and address loading):

A: Load Command “0000 0011”.

B: Load Address Low Byte ($00 - $FF).

Set OE to “0”, and BS to “0”. The EEPROM data byte can now be read at DATA.

Set OE to “1”.

DATA HIGH

DATA

XA1

XA0

XTAL1

RDY/BSY

RESET

+12V

AT90LS4433-4AI Datasheet(PDF) 90 Page - ATMEL Corporation