MCP3909 datasheet(30/44 Pages) MICROCHIP

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MCP3909

DS22025B-page 30

5.7

Using the MCP3909 with

Microcontroller (MCU) SPI Ports

With microcontroller SPI ports, it is required to send

groups of eight bits. It is also required that the

microcontroller SPI port be configured to clock out data

on the falling edge of clock and latch data in on the

rising edge, or vice versa depending on the mode.

5.7.1

SPI MODE DEFINITIONS

The following table represents the standard SPI mode

terminology, the respective PIC bit settings, and a

description of compatibility for the MCP3909 device.

The MCP3909 works in SPI mode 0,1 mode, that is the

data is clocked out of the part on the rising edge and

clocked in on the falling edge of SCK.

TABLE 5-4:

SPI MODE COMPATIBILITY

Standard SPI

Mode

Terminology

PIC Control Bits

State

MCP3909

Compatibility

Description

CKP

CKE

0,0

—

Idle state for clock is low level, transmit (from PIC)

occurs from active to idle clock state

0,1

√

Idle state for clock is low level, transmit (from PIC)

occurs from idle to active clock state

1,0

—

Idle state for clock is high level, transmit (from PIC)

occurs from active to idle clock state

1,1

—

Idle state for clock is high level, transmit (from PIC)

occurs from idle to active clock state

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