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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny167-ESSZ датащи(PDF) 71 Page - ATMEL Corporation |
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ATtiny167-ESSZ датащи(HTML) 71 Page - ATMEL Corporation |
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71 / 282 page  71 7728D–AVR–07/09 ATtiny87/ATtiny167 Figure 9-5. Synchronization when Reading a Software Assigned Pin Value The following code example shows how to set port B pins 0 and 1 high, 2 and 3 low, and define the port pins from 4 to 7 as input with pull-ups assigned to port pins 6 and 7. The result- ing 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: 1. For the assembly program, two temporary registers are used to minimize the time from pull-ups are set on pins 0, 1, 6, and 7, until the direction bits are correctly set, defining bit 2 and 3 as low and redefining bits 0 and 1 as strong high drivers. Assembly Code Example (1) ... ; Define pull-ups and set outputs high ; Define directions for port pins ldi r16,(1<<PB7)|(1<<PB6)|(1<<PB1)|(1<<PB0) ldi r17,(1<<DDB3)|(1<<DDB2)|(1<<DDB1)|(1<<DDB0) out PORTB,r16 out DDRB,r17 ; Insert nop for synchronization nop ; Read port pins in r16,PINB ... C Code Example unsigned char i; ... /* Define pull-ups and set outputs high */ /* Define directions for port pins */ PORTB = (1<<PB7)|(1<<PB6)|(1<<PB1)|(1<<PB0); DDRB = (1<<DDB3)|(1<<DDB2)|(1<<DDB1)|(1<<DDB0); /* Insert nop for synchronization*/ __no_operation(); /* Read port pins */ i = PINB; ... out PORTx, r16 nop in r17, PINx 0xFF 0x00 0xFF SYSTEM CLK r16 INSTRUCTIONS SYNC LATCH PINxn r17 t pd |
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