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AT90PWM2 Datasheet(PDF) 186 Page - ATMEL Corporation |
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AT90PWM2 Datasheet(HTML) 186 Page - ATMEL Corporation |
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186 / 365 page  186 AT90PWM2/3 4317B–AVR–02/05 The following code examples show how to initialize the SPI as a Slave and how to per- form a simple 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 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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