CDB4392 datasheet(16/40 Pages) CIRRUS

16 / 40 page

CS4392

DS459PP3

4.0.3

SPI Mode

In SPI mode, data is clocked into the serial control data line, CDIN, by the serial control port clock,

CCLK (see Figure 9 for the clock to data relationship). There is no AD0 pin. Pin CS is the chip

select signal and is used to control SPI writes to the control port. 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.

4.0.3a

SPI Write

To write to the device, follow the procedure below while adhering to the control port

Switching Specifications in section 7.

1) Bring CS low.

2) The address byte on the CDIN pin must then be 00100000.

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

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

5) If the INCR bit (see section 4.0.1) is set to 1, repeat the previous step until all the desired

registers are written, then bring CS high.

6) If the INCR bit is set to 0 and further SPI writes to other registers are desired, it is nec-

essary to bring CS high, and follow the procedure detailed from step 1. If no further writes

to other registers are desired, bring CS high.

4.1

Memory Address Pointer (MAP)

MAP

MSB

LS B

DATA

byte 1

byte n

R/W

MA P = Me mo ry A d dre s s P o in te r

ADDRESS

CH IP

CD IN

CC L K

00 10 00 0

Figure 9. Control Port Timing, SPI mode

4.1.1 INCR (AUTO MAP INCREMENT ENABLE)

Default = ‘0’

0 - Disabled,

the MAP will stay constant for successive writes

1 - Enabled,

the MAP will auto increment after each byte is written, allowing block reads or

writes of successive registers

4.1.2 MAP3-0 (MEMORY ADDRESS POINTER)

Default = ‘0000’

76543210

INCR

Reserved

MAP3

MAP2

MAP1

MAP0

00000000

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