Rainbow-electronics ATtiny15L Manual de usuario descargar pdf (Pagina 61)

ATtiny15L

1187E–AVR–06/02

Data Polling When a byte is being programmed into the Flash or EEPROM, 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_FL

before programming the next

Flash byte, or t

WD_PROG_EE

before the next EEPROM byte. As a chip-erased device con-

tains $FF in all locations, programming of addresses that are meant to contain $FF can

be skipped. This does not apply if the EEPROM is reprogrammed without chip-erasing

the device. In that case, data polling cannot be used for the value $FF and the user will

have to wait at least t

WD_PROG_EE

before programming the next byte. See Table 30 for

WD_PROG_FL

and t

WD_PROG_EE

values.

Figure 34. Low-voltage Serial Programming Waveforms

MSB

LSB

SERIAL CLOCK INPUT

PB2(SCK)

SERIAL DATA INPUT

PB0(MOSI)

SERIAL DATA OUTPUT

PB1(MISO)

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 82 83

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Rainbow-electronics ATtiny15L Manual de usuario Pagina 61