Rainbow-electronics ATtiny10 Manual do Utilizador descarregar pdf (Página 45)

8127B–AVR–08/09

ATtiny4/5/9/10

10.2.7 Program Example

The following code example shows how to set port B pin 0 high, pin 1 low, and define the port

pins from 2 to 3 as input with a pull-up assigned to port pin 2. The resulting pin values are read

back again, but as previously discussed, a nop instruction is included to be able to read back the

value recently assigned to some of the pins.

Note: See “Code Examples” on page 5.

10.3 Alternate Port Functions

Most port pins have alternate functions in addition to being general digital I/Os. In Figure 10-6

below is shown how the port pin control signals from the simplified Figure 10-2 on page 41 can

be overridden by alternate functions.

Assembly Code Example

...

; Define pull-ups and set outputs high

; Define directions for port pins

ldi r16,(1<<PUEB2)

ldi r17,(1<<PB0)

ldi r18,(1<<DDB1)|(1<<DDB0)

out PUEB,r16

out PORTB,r17

out DDRB,r18

; Insert nop for synchronization

nop

; Read port pins

in r16,PINB

...

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 165 166

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Rainbow-electronics ATtiny10 Manual do Utilizador Página 45