at90ls4433 ATMEL Corporation, at90ls4433 Datasheet - Page 90

• Manufacturer Part Number: at90ls4433
• Description: At90s4433 8-bit Avr Microcontroller With 4k Bytes Of In-system Programmable Flash
• Manufacturer: ATMEL Corporation

Reading the Flash
Programming the EEPROM
Reading the EEPROM
90
AT90S/LS4433
Figure 64. Programming the Flash Waveforms (Continued)
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).
1. Set OE to “0”, and BS to “0”. The Flash word Low Byte can now be read at
2. Set BS to “1”. The Flash word High Byte can now be read from DATA.
3. Set OE to “1”.
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.
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).
1. Set OE to “0”, and BS to “0”. The EEPROM data byte can now be read at DATA.
2. Set OE to “1”.
RDY/BSY
RESET
DATA.
XTAL1
DATA
XA1
XA0
WR
OE
BS
+12V
DATA HIGH
1042H–AVR–04/03