AS3911 datasheet(45/159 Pages) AMSCO

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[v2-11] 2016-Jun-13

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AS3911 − Application Information

Direct Command Mode

Direct Command Mode has no arguments, so a single byte is

sent. SPI operation mode bits 11 indicate Direct Command

Mode. The following six bits define command code, sent MSB

to the LSB. The command is executed on falling edge of last

clock.

While execution of some Direct Commands is immediate, there

are others which start a process of certain duration (calibration,

measurement…). During execution of such commands it is not

allowed to start another activity over the SPI interface. After

execution of such a command is terminated an IRQ is sent.

Figure 31:

SPI Communication: Direct Command

Direct Command Chaining

Direct commands with immediate execution can be followed

by another SPI mode (Read, Write or FIFO) without deactivating

/SS signal in between.

Figure 32:

Direct Command Chaining

SCLK rising

edge Data is

transfered

from µC

SCLK falling

edge Data is

sampled

/SS rising edge

signals start of

command

execution

Two leading

ONE indicate

COMMAND

Mode

/SS

SCLK

MOSI

/SS

Direct Command

Read, Write or FIFO Mode

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