at90ls4433 ATMEL Corporation, at90ls4433 Datasheet - Page 95

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

Data Polling Flash
1042H–AVR–04/03
When a byte is being programmed into the Flash, reading the address location being
programmed will give the value $FF. At the time the device is ready for a new byte, the
programmed value will read correctly. This is used to determine when the next byte can
be written. This will not work for the value $FF, so when programming this value, the
user will have to wait for at least t
erased device contains $FF in all locations, programming of addresses that are meant
to contain $FF can be skipped.
Figure 67. Serial Programming Waveforms
SERIAL DATA OUTPUT
SERIAL CLOCK INPUT
SERIAL DATA INPUT
PB3(MOSI)
PB4(MISO)
PB5(SCK)
MSB
MSB
WD_PROG
before programming the next byte. As a chip-
AT90S/LS4433
LSB
LSB
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