Rainbow-electronics ATtiny12 Bedienungsanleitung PDF herunterladen (Seite 47)

ATtiny11/12

1006C–09/01

High-voltage Serial

Programming Algorithm

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

and GND. Set PB5 and PB0

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.

2. The Flash array is programmed one byte at a time by supplying first the address,

then the low and high data byte. The write instruction is self-timed, wait until the

PB2 (RDY/BSY

) pin goes high.

3. The EEPROM array (ATtiny12 only) is programmed one byte at a time by supply-

ing first the address, then the data byte. The write instruction is self-timed, wait

until the PB2 (RDY/BSY

) pin goes high.

4. Any memory location can be verified by using the Read instruction which returns

the contents at the selected address at serial output PB2.

5. Power-off sequence:Set PB3 to “0”.

Set PB5 to “1”.

Tu r n V

power off.

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.

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Rainbow-electronics ATtiny12 Bedienungsanleitung Seite 47