MCP413X Datasheet, PDF(44/88 Page) Microchip Technology – 7/8-Bit Single/Dual SPI Digital POT with Volatile Memory

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MCP413X Datasheet, PDF (44/88 Pages) Microchip Technology – 7/8-Bit Single/Dual SPI Digital POT with Volatile Memory

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MCP413X/415X/423X/425X

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 6-3 through Figure 6-8 show the different SPI

command waveforms. Figure 6-3 and Figure 6-4 are

read and write commands. Figure 6-5 and Figure 6-6

are read commands when the SDI and SDO pins are

multiplexed on the same pin (SDI/SDO). Figure 6-7

and Figure 6-8 are increment and decrement

commands.

VIH

SCK

VIHH (1)

VIL

Write to

SSPBUF

SDO

SDI

CMDERR bit

bit15 bit14 bit13 bit12 bit11 bit10 bit9 bit8 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0

AD3 AD2 AD1 AD0

bit15 bit14 bit13 bit12 C1

X D8 D7 D6 D5 D4 D3 D2 D1 D0

C0 bit9 bit8 bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0

Input

Sample

Note 1: VIHH is supported for compability with the MCP414X/6X and MCP424X/6X devices high voltage

operation.

FIGURE 6-3:

16-Bit Commands (Write, Read) - SPI Waveform (Mode 1,1).

VIH

VIHH(1)

VIL

SCK