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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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ATmega165 bảng dữ liệu(PDF) 178 Page - ATMEL Corporation |
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ATmega165 bảng dữ liệu(HTML) 178 Page - ATMEL Corporation |
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178 / 336 page  178 ATmega165/V 2573G–AVR–07/09 The following code demonstrates how to use the USI module as a SPI Master with max- imum speed (fsck = 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 SPI Slave Operation Example The following code demonstrates how to use the USI module as a SPI Slave: init: ldi r16,(1<<USIWM0)|(1<<USICS1) sts USICR,r16 ... SlaveSPITransfer: sts USIDR,r16 ldi r16,(1<<USIOIF) sts USISR,r16 SlaveSPITransfer_loop: lds r16, USISR sbrs r16, USIOIF rjmp SlaveSPITransfer_loop lds r16,USIDR ret The code is size optimized using only eight instructions (+ ret). The code example assumes that the DO is configured as output and USCK pin is configured as input in the DDR Register. The value stored in register r16 prior to the function is called is trans- ferred to the master device, and when the transfer is completed the data received from the Master is stored back into the r16 Register. |
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