CS5467-IS データシートの表示（PDF） - Cirrus Logic

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CS5467-IS

Four-channel Power / Energy IC

Cirrus Logic 

CS5467

7.4 Command Interface

Commands and data are transferred most-significant bit

(MSB) first. Figure 1 on page 12, defines the serial port

timing. Commands are clocked in on SDI using SCLK.

They are a single byte (8 bits) long and fall into one of

four basic types:

1. Register Read

2. Register Write

3. Synchronizing

4. Instructions

Register reads will cause up to four bytes of register

data to be clocked out, MSB first on the SDO pin by

SCLK. During this time, other commands can be

clocked in on the SDI pin. Other commands will not in-

terrupt read data, except another register read, which

will cause the new read data to appear on SDO.

Synchronizing can be sent while read data is being

clocked out if no other commands need to be sent.

Synchronizing commands are also used to synchronize

the serial port to a byte boundary. The CS and RESET

pins will also synchronize the serial port.

Register writes require three bytes of write data to fol-

low, clocked in on the SDI pin, MSB first by SCLK.

Instructions are commands that will interrupt any in-

struction currently executing and begin the new instruc-

tion. These include conversions, calibrations, power

control, and soft reset.

(See Section 7.6 Commands on page 25).

7.5 Register Paging

Read and Write commands access one of 32 registers

within a specified page. The Register Page Select reg-

ister’s (Page) default value is 0. To access registers in

another page, write the desired page number to the

Page register. The Page register is always at address

31 and is accessible from within any page.

24

DS714F1

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