MCP3914 datasheet(42/80 Pages) MICROCHIP

42 / 80 page

MCP3914

DS20005216A-page 42

 2013 Microchip Technology Inc.

6.4

Writing to the Device

The first register written from the SDI pin to the device

is the one defined by the address (A<4:0>) given in the

CONTROL byte. After this first register is fully

transmitted, if the CS pin is maintained logic low, the

communication continues without an additional control

byte and the SDI pin transmits another register with the

address automatically incremented or not, depending

on the WRITE bit setting.

Two different Write-mode configurations for the

address increment can be defined through the WRITE

bit in the STATUSCOM register (see Section 6.5,

Continuous Communications, Looping on Register

Sets

and Table 8-2). The SDO pin stays in a high-

impedance state during a write communication. The

data on SDI is clocked into the MCP3914 on the rising

edge of SCK. The writing format for each register is

defined

Section 6.5,

Continuous

Communications, Looping on Register Sets

. A write

on an undefined or non-writable address, such as the

ADC channel’s register addresses, will have no effect

and also will not increment the address counter.

FIGURE 6-4:

Write to a Single Register with 24-bit Format (SPI Mode 1,1).

FIGURE 6-5:

Write to a Single Register with 24-bit Format (SPI Mode 0,0).

WRITE Communication (SPI mode 1,1)

Don’t care

SCK

SDI

SDO

Hi-Z

Device latches SDI on rising edge

R/W

Don’t

care

DATA<0>

WRITE Communication (SPI mode 0,0)

Don’t care

SCK

SDI

SDO

Hi-Z

Device latches SDI on rising edge

Don’t care

DATA<23>

MCP3914 Datasheet(PDF) 42 Page - Microchip Technology

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