デジタル通信（SPI)

1 SPI) Serial Peripheral Interface 3 4 1 8bit b7b6b5b4b3b2b1b0b8 b7b6b5b4b3b2b1b0b8 b8 SPI) 10110100 1 01110101 SPI) 01101000 2 1 11101011 1 0 SPI) 01110101 3 8 10110100 0 1 (I2C, SPI)5 V V 5 V5 V High = 5 V Low = 0 V High = V Low = 0 V 5V (I2C, SPI)DSG5 V V +5 V+ V+ V5 V V V 5 V DSG5 V V +5 V+ V+ V5 V 0V V 0 V 1 GND 2 VGS (2V FET ON 3 5V GND 3 1 VGS > 2 VON 2 V 0V V 5 V DSG5 V V +5 V+ V+ V0 V 5 V 0 V V 1 3 3V 2 VGS (2V FET OFF 3 5V High ( 5 V)

2 3 1 VGS < 2 VOFF 2 0 V V 5 V V DSG5 V V +5 V+ V+ V5 V 0V V 1 5V GND 2 MOSFET 3 VGS (2V FET ON 4 GND 1 2 VGS > 2 VON 3 5V 0V 0V 4 5 V V DSG5 V V +5 V+ V+ V0 V 5V 0 V 1 5V 5V 2 FET ON D S S 3 VGS (2V FET OFF 4 3 3V 1 2 VGS < 2 VOFF 3 0V 5V 4 SPI 4 / ( CPOL(Clock Polarity), CKP ) ( CPHA(Clock Phase), CKE(Clock select) ) 4 '0' 'L' 0 V), '1' 'H' 5 V, V '0' 'H' 5 V, V) '1' 'L' 0 V SPI (SKP=0, SKE=0) (CKP=0) 0 1 (SKE=0)b6b7b5b4b30 (='L')1 (='H')010101010 PIC SMP=1 b6b7b5b4b3 SMP =0 PIC SPI (SKP=0, SKE=1) (CKP=0) 1 0 (CKE=1)b6b7b5b4b30 (='L')1 (='H')010101010 PIC SMP=1 b6b7b5b4b3 SMP =0 PIC SPI (SKP=1, SKE=0) (SKP=1) 0 1 (SKE=0)b6b7b5b4b30 (='H')1 (='L')010101010 PIC PICSMP=1 b6b7b5b4b3 SMP =0 SPI (SKP=1, SKE=1) (SKP=1) 1 0 (SKE=1)b6b7b5b4b30 (='H')1 (='L')010101010 PIC PICSMP=1 b6b7b5b4b3 SMP =0