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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ATmega169P 데이터시트(PDF) 162 Page - ATMEL Corporation |
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ATmega169P 데이터시트(HTML) 162 Page - ATMEL Corporation |
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162 / 393 page  162 8018N–AVR–08/09 ATmega169P The following code examples show how to initialize the SPI as a Slave and how to perform a simple reception. Note: 1. ”About Code Examples” on page 10. Assembly Code Example (1) SPI_SlaveInit: ; Set MISO output, all others 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 complete 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 others input */ DDR_SPI = (1<<DD_MISO); /* Enable SPI */ SPCR = (1<<SPE); } char SPI_SlaveReceive(void) { /* Wait for reception complete */ while (!(SPSR & (1<<SPIF))) ; /* Return Data Register */ return SPDR; } |
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