MCP3912 datasheet(44/82 Pages) MICROCHIP

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MCP3912

DS20005348A-page 44

 2014 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, Con-

tinuous 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 MCP3912 on the rising

edge of SCK. The writing format for each register is

defined in Section 6.5, Continuous Communica-

tions, Looping on Register Sets

. A write on an unde-

fined or nonwritable 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>

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