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MCP41010E/P 데이터시트(PDF) 22 Page - Microchip Technology |
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MCP41010E/P 데이터시트(HTML) 22 Page - Microchip Technology |
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22 / 32 page ![]() MCP41XXX/42XXX DS11195C-page 22 2003 Microchip Technology Inc. 5.8 Using the MCP41XXX/42XXX in SPI Mode 1,1 It is possible to operate the devices in SPI modes 0,0 and 1,1. The only difference between these two modes is that, when using mode 1,1, the clock idles in the high state, while in mode 0,0, the clock idles in the low state. In both modes, data is clocked into the devices on the rising edge of SCK and data is clocked out the SO pin once the falling edge of SCK. Operations using mode 0,0 are shown in Figure 5-1. The example in Figure 5-5 shows mode 1,1. FIGURE 5-5: Timing Diagram for SPI Mode 1,1 Operation. SO‡ SI SCK CS† 23 456 7 8 9 10 1 New Register Data D7 D6 D5 D4 D3 D2 D1 D0 P1* P0 11 12 13 14 15 16 X C1 C0 X X X Channel Select Bits Data Registers are loaded on rising edge of CS. Shift First 16 bits Shifted out will always be zeros Don’t Care Bits Command Bits Don’t Care Bits † There must always be multiples of 16 clocks while CS is low or commands will abort. ‡ The serial data out pin (SO) is only available on the MCP42XXX device. COMMAND BYTE DATA BYTE X register is loaded with zeros at this time. Data is always latched in on the rising edge of SCK. Data is always clocked out the SO pin after the falling edge of SCK. SO pin will always drive low when CS goes high. |
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