ATtiny10/11/12
47
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_FLASH
or t
WD_EEPROM
before programming the next 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_EEPROM
before programming the next byte. See Table 28 for t
WD_FLASH
and
t
WD_EEPROM
values.
Figure 31. Low-voltage Serial Programming Waveforms
MSB
MSB
LSB
LSB
SERIAL CLOCK INPUT
PB2(SCK)
SERIAL DATA INPUT
PB0(MOSI)
SERIAL DATA OUTPUT
PB1(MISO)
