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ATtiny261A Datasheet(PDF) 58 Page - ATMEL Corporation |
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ATtiny261A Datasheet(HTML) 58 Page - ATMEL Corporation |
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58 / 292 page  58 8197A–AVR–10/09 ATtiny261A/461A/861A Note: See “Code Examples” on page 6. 10.2 Alternate Port Functions Most port pins have alternate functions in addition to being general digital I/Os. Figure 10-5 shows how the port pin control signals from the simplified Figure 10-2 can be overridden by alternate functions. The overriding signals may not be present in all port pins, but the figure serves as a generic description applicable to all port pins in the AVR microcontroller family. C Code Example unsigned char i; ... /* Define pull-ups and set outputs high */ /* Define directions for port pins */ PORTB = (1<<PB4)|(1<<PB1)|(1<<PB0); DDRB = (1<<DDB3)|(1<<DDB2)|(1<<DDB1)|(1<<DDB0); /* Insert nop for synchronization*/ _NOP(); /* Read port pins */ i = PINB; ... |
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