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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega325P датащи(PDF) 194 Page - ATMEL Corporation |
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ATmega325P датащи(HTML) 194 Page - ATMEL Corporation |
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194 / 364 page  194 8023F–AVR–07/09 ATmega325P/3250P rjmp SPITransfer_loop lds r16,USIDR ret The code is size optimized using only eight instructions (+ ret). The code example assumes that the DO and USCK pins are enabled as output in the DDRE Register. The value stored in register r16 prior to the function is called is transferred to the Slave device, and when the transfer is com- pleted the data received from the Slave is stored back into the r16 Register. The second and third instructions clears the USI Counter Overflow Flag and the USI counter value. The fourth and fifth instruction set Three-wire mode, positive edge Shift Register clock, count at USITC strobe, and toggle USCK. The loop is repeated 16 times. The following code demonstrates how to use the USI module as a SPI Master with maximum speed (f sck = fck/4): SPITransfer_Fast: sts USIDR,r16 ldi r16,(1<<USIWM0)|(0<<USICS0)|(1<<USITC) ldi r17,(1<<USIWM0)|(0<<USICS0)|(1<<USITC)|(1<<USICLK) sts USICR,r16 ; MSB sts USICR,r17 sts USICR,r16 sts USICR,r17 sts USICR,r16 sts USICR,r17 sts USICR,r16 sts USICR,r17 sts USICR,r16 sts USICR,r17 sts USICR,r16 sts USICR,r17 sts USICR,r16 sts USICR,r17 sts USICR,r16 ; LSB sts USICR,r17 lds r16,USIDR ret |
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