TINY12 ATMEL [ATMEL Corporation], TINY12 Datasheet - Page 54

• Manufacturer Part Number: TINY12
• Description: 8-bit AVR Microcontroller with 1K Byte Flash
• Manufacturer: ATMEL [ATMEL Corporation]

Data Polling
54
ATtiny11/12
6. Any memory location can be verified by using the Read instruction which returns
7. At the end of the programming session, RESET can be set high to commence
8. Power-off sequence (if needed):
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
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. 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
before programming the next byte. See Table 28 for t
Figure 31. Low-voltage Serial Programming Waveforms
SERIAL DATA OUTPUT
SERIAL CLOCK INPUT
SERIAL DATA INPUT
next instruction. See Table 28 on page 56 for t
an erased device, no $FFs in the data file(s) needs to be programmed.
the content at the selected address at the serial output MISO (PB1) pin.
normal operation.
Set XTAL1 to “0” (if external clocking is used).
Set RESET to “1”.
Turn V
CC
PB0(MOSI)
PB1(MISO)
PB2(SCK)
power off.
MSB
MSB
WD_FLASH
WD_FLASH
or t
WD_FLASH
WD_EEPROM
and t
and t
WD_EEPROM
before programming
WD_EEPROM
1006D–AVR–07/03
values. In
LSB
LSB
WD_EEPROM
values.