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ATmega325P データシート(PDF) 160 Page - ATMEL Corporation |
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ATmega325P データシート(HTML) 160 Page - ATMEL Corporation |
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160 / 364 page  160 8023F–AVR–07/09 ATmega325P/3250P Figure 17-3. SPI Transfer Format with CPHA = 0 Figure 17-4. SPI Transfer Format with CPHA = 1 17.5 Register Description 17.5.1 SPCR – SPI Control Register • Bit 7 – SPIE: SPI Interrupt Enable This bit causes the SPI interrupt to be executed if SPIF bit in the SPSR Register is set and the if the Global Interrupt Enable bit in SREG is set. Bit 1 Bit 6 LSB MSB SCK (CPOL = 0) mode 0 SAMPLE I MOSI/MISO CHANGE 0 MOSI PIN CHANGE 0 MISO PIN SCK (CPOL = 1) mode 2 SS MSB LSB Bit 6 Bit 1 Bit 5 Bit 2 Bit 4 Bit 3 Bit 3 Bit 4 Bit 2 Bit 5 MSB first (DORD = 0) LSB first (DORD = 1) SCK (CPOL = 0) mode 1 SAMPLE I MOSI/MISO CHANGE 0 MOSI PIN CHANGE 0 MISO PIN SCK (CPOL = 1) mode 3 SS MSB LSB Bit 6 Bit 1 Bit 5 Bit 2 Bit 4 Bit 3 Bit 3 Bit 4 Bit 2 Bit 5 Bit 1 Bit 6 LSB MSB MSB first (DORD = 0) LSB first (DORD = 1) Bit 7 6 543210 0x2C (0x4C) SPIE SPE DORD MSTR CPOL CPHA SPR1 SPR0 SPCR Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 000000 |
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