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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATmega162 датащи(PDF) 161 Page - ATMEL Corporation |
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ATmega162 датащи(HTML) 161 Page - ATMEL Corporation |
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161 / 324 page  161 2513K–AVR–07/09 ATmega162/V The following code examples show how to initialize the SPI as a slave and how to perform a sim- ple reception. Note: 1. The example code assumes that the part specific header file is included. Assembly Code Example(1) SPI_SlaveInit: ; Set MISO output, all o?hers input ldi r17,(1<<DD_MISO) out DDR_SPI,r17 ; Enable SPI ldi r17,(1<<SPE) out SPCR,r17 ret SPI_SlaveReceive: ; Wait for reception com?lete sbis SPSR,SPIF rjmp SPI_SlaveReceive ; Read received data and?return in r16,SPDR ret C Code Example (1) void SPI_SlaveInit(void) { /* Set MISO output, all ?thers input */ DDR_SPI = (1<<DD_MISO); /* Enable SPI */ SPCR = (1<<SPE); } char SPI_SlaveReceive(void) { /* Wait for reception co?plete */ while (!(SPSR & (1<<?PIF))) ; /* Return data register ?/ return SPDR; } |
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