參數(shù)資料
型號: SC80C32XXX-36SV
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 36 MHz, MICROCONTROLLER, CDIP40
封裝: 0.600 INCH, SIDE BRAZED, DIP-40
文件頁數(shù): 68/109頁
文件大?。?/td> 10824K
代理商: SC80C32XXX-36SV
47
ATtiny20 [DATASHEET]
8235E–AVR–03/2013
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:
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 43 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
...
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