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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT90PWM2 датащи(PDF) 177 Page - ATMEL Corporation |
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AT90PWM2 датащи(HTML) 177 Page - ATMEL Corporation |
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177 / 361 page  177 4317J–AVR–08/10 AT90PWM2/3/2B/3B Note: 1. The example code assumes that the part specific header file is included. 17.2 SS Pin Functionality 17.2.1 Slave Mode When the SPI is configured as a Slave, the Slave Select (SS) pin is always input. When SS is held low, the SPI is activated, and MISO becomes an output if configured so by the user. All other pins are inputs. When SS is driven high, all pins are inputs, and the SPI is passive, which TABLE 2. 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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