CS4350 datasheet(26/39 Pages) CIRRUS

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DS691A3

CS4350

6.3.2

SPI Read

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

Characteristics - Control Port - SPI Format” on page 14.

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 6.1) 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.

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

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

desired, bring CS high.

6.4

Memory Address Pointer (MAP)

6.4.1

INCR (Auto Map Increment Enable)

Default = ‘0’

0 - Disabled

1 - Enabled

6.4.2

MAP (Memory Address Pointer)

Default = ‘0000’

76543210

INCR

Reserved

MAP3

MAP2

MAP1

MAP0

00000000

MA P

MSB

LSB

DATA

by te 1

by te n

R/W

AD D R ESS

CHIP

ADDRESS

CH I P

MSB

LSB MSB

LSB

MAP = Memory Address Pointer, 8 bits, MSB first

High Impedance

1001111

CCLK

CDIN

CDOUT

Figure 17. Control Port Timing, SPI Mode

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