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MCP433X データシート(PDF) 49 Page - Microchip Technology |
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MCP433X データシート(HTML) 49 Page - Microchip Technology |
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49 / 88 page  2010 Microchip Technology Inc. DS22242A-page 49 MCP433X/435X 6.2 The SPI Modes The SPI module supports two (of the four) standard SPI modes. These are Mode 0,0 and 1,1. The mode is determined by the state of the SDI pin on the rising edge of the 1st clock bit (of the 8-bit byte). 6.2.1 MODE 0,0 In Mode 0,0: SCK Idle state = low (VIL), data is clocked in on the SDI pin on the rising edge of SCK and clocked out on the SDO pin on the falling edge of SCK. 6.2.2 MODE 1,1 In Mode 1,1: SCK Idle state = high (VIH), data is clocked in on the SDI pin on the rising edge of SCK and clocked out on the SDO pin on the falling edge of SCK. 6.3 SPI Waveforms Figure 6-2 through Figure 6-5 show the different SPI command waveforms. Figure 6-2 and Figure 6-3 are read and write commands. Figure 6-4 and Figure 6-5 are Increment and Decrement commands. Support of High Voltage commands allows circuit compatibility with the corresponding nonvolatile device. FIGURE 6-2: 16-Bit Commands (Write, Read) – SPI Waveform (Mode 1,1). FIGURE 6-3: 16-Bit Commands (Write, Read) – SPI Waveform (Mode 0,0). CS SCK Write to SSPBUF SDI Input Sample SDO bit15 bit14 bit13 bit12 bit11 bit10 bit9 bit8 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 bit15 bit14 bit13 bit12 bit9 bit8 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 AD3 AD2 AD1 AD0 C1 C0 X D8 D7 D6 D5 D4 D3 D2 D1 D0 VIH VIL CMDERR bit VIHH CS SCK Write to SSPBUF SDI Input Sample SDO bit15 bit14 bit13 bit12 bit11 bit10 bit9 bit8 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 bit15 bit14 bit13 bit12 bit9 bit8 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0 AD3 AD2 AD1 AD0 C1 C0 X D8 D7 D6 D5 D4 D3 D2 D1 D0 VIH VIL CMDERR bit VIHH |
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