CS42324 datasheet(42/71 Pages) CIRRUS

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DS721A6

CS42324

Send start condition.

Send 10011xx0 (chip address & write operation).

Receive acknowledge bit.

Send MAP byte, auto increment off.

Receive acknowledge bit.

Send stop condition, aborting write.

Send start condition.

Send 10011xx1(chip address & read operation).

Receive acknowledge bit.

Receive byte, contents of selected register.

Send acknowledge bit.

Send stop condition.

Setting the auto increment bit in the MAP allows successive reads or writes of consecutive registers. Each

byte is separated by an acknowledge bit.

4.6.3

Software Mode - SPI Control Port

In SPI Mode, data is clocked into the serial control data line, CDIN, by the serial clock, CCLK (see Figure 22

for the clock to data relationship). There are no AD0 or AD1 pins. Pin CS is the chip select signal and is

used to control SPI writes to the registers. When the device detects a high-to-low transition on the AD0/CS

pin after power-up, SPI Mode will be selected. All signals are inputs and data is clocked in on the rising edge

of CCLK.

4.6.3.1

SPI Write

To write to the device, follow the procedure below while adhering to the Software Mode switching speci-

fications in “Switching Characteristics - Software Mode - SPI Format” section on page 25.

Bring CS low.

The address byte on the CDIN pin must then be 10011110 (R/W =0).

Write to the memory address pointer, MAP. This byte points to the register to be written.

Write the desired data to the register pointed to by the MAP.

If the INCR bit (see Section 4.6.4.1) is set to 1, repeat the previous step until all the desired registers

are written, then bring CS high.

If the INCR bit is set to 0 and further SPI writes to other registers are desired, it is necessary to bring

CS high, and follow the procedure detailed from step 1. If no further writes to other registers are

desired, bring CS high

4.6.3.2

SPI Read

To read from the device, follow the procedure below while adhering to the values specified in “Switching

Characteristics - Software Mode - SPI Format” section on page 25.

Bring CS low.

The address byte on the CDIN pin must then be 10011111 (R/W =1).

CDOUT pin will then output the data from the register pointed to by the MAP, which is set during the

SPI write operation.

If the INCR bit (see Section 4.6.4.1) is set to 1, keep CS low and continue providing clocks on CCLK

to read from multiple consecutive registers. Bring CS high when reading is complete.

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