Rainbow-electronics AT90LS4433 Manual de usuario descargar pdf (Pagina 95)

AT90S/LS4433

1042G–AVR–09/02

Data Polling Flash 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

WD_PROG

before programming the next byte. As a chip-

erased device contains $FF in all locations, programming of addresses that are meant

to contain $FF can be skipped.

Figure 67. Serial Programming Waveforms

MSB

LSB

SERIAL CLOCK INPUT

PB5(SCK)

SERIAL DATA INPUT

PB3(MOSI)

SERIAL DATA OUTPUT

PB4(MISO)

1 2 ... 90 91 92 93 94 95 96 97 98 99 100 ... 124 125

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Rainbow-electronics AT90LS4433 Manual de usuario Pagina 95