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ATmega32U2 Datasheet(PDF) 144 Page - ATMEL Corporation |
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ATmega32U2 Datasheet(HTML) 144 Page - ATMEL Corporation |
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144 / 314 page  144 7799B–AVR–07/09 ATmega8U2/16U2/32U2 Figure 17-3. SPI Transfer Format with CPHA = 0 Figure 17-4. SPI Transfer Format with CPHA = 1 Table 17-2. CPOL Functionality Leading Edge Trailing eDge SPI Mode CPOL=0, CPHA=0 Sample (Rising) Setup (Falling) 0 CPOL=0, CPHA=1 Setup (Rising) Sample (Falling) 1 CPOL=1, CPHA=0 Sample (Falling) Setup (Rising) 2 CPOL=1, CPHA=1 Setup (Falling) Sample (Rising) 3 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) |
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