ATTINY12 ATMEL Corporation, ATTINY12 Datasheet - Page 49

• Manufacturer Part Number: ATTINY12
• Description: 8-bit AVR Microcontroller with 1K Byte Flash
• Manufacturer: ATMEL Corporation

High-voltage Serial
Programming Algorithm
1006D–AVR–07/03
To program and verify the ATtiny11/12 in the High-voltage Serial Programming mode,
the following sequence is recommended (See instruction formats in Table 23):
1. Power-up sequence: Apply 4.5 - 5.5V between V
2. The Flash array is programmed one byte at a time by supplying first the address,
3. The EEPROM array (ATtiny12 only) is programmed one byte at a time by supply-
4. Any memory location can be verified by using the Read instruction which returns
5. Power-off sequence:Set PB3 to “0”.
When writing or reading serial data to the ATtiny11/12, data is clocked on the rising
edge of the serial clock, see Figure 28, Figure 29 and Table 24 for details.
to “0” and wait at least 100 ns. Toggle PB3 at least four times with minimum 100
ns pulse-width. Set PB3 to “0”. Wait at least 100 ns. Apply 12V to PB5 and wait
at least 100 ns before changing PB0. Wait 8 µs before giving any instructions.
then the low and high data byte. The write instruction is self-timed, wait until the
PB2 (RDY/BSY) pin goes high.
ing first the address, then the data byte. The write instruction is self-timed, wait
until the PB2 (RDY/BSY) pin goes high.
the contents at the selected address at serial output PB2.
Turn V
Set PB5 to “1”.
CC
power off.
CC
and GND. Set PB5 and PB0
ATtiny11/12
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