CS4360 datasheet(25/36 Pages) CIRRUS

25 / 36 page

CS4360

DS517PP1

waiting for the CS4360 to acknowledge between

each byte. To end the transaction, send a STOP

condition.

7.3.2

Reading in Two-Wire Format

To communicate with the CS4360, initiate a

START condition of the bus. Next, send the chip

address. The eighth bit of the address byte is the

R/W bit (high for a read). The contents of the reg-

ister pointed to by the MAP will be output after the

chip address. To read multiple registers, continue

providing a clock and issue an ACK after each

byte. To end the transaction, send a STOP condi-

tion.

7.4

SPI Format

In SPI format, CS is the CS4360 chip select signal,

CCLK is the control port bit clock, CDIN is the in-

put data line from the microcontroller and the chip

address is 0010000. CS, CCLK and CDIN are all

inputs and data is clocked in on the rising edge of

CCLK.

Note that the CS4360 is write-only when in SPI

format.

7.4.1

Writing in SPI

Figure 6 shows the operation of the control port in

SPI format. To write to a register, bring CS low.

The first 7 bits on CDIN form the chip address and

must be 0010000. The eighth bit is a read/write in-

dicator (R/W), which must be low to write. The

next 8 bits form the Memory Address Pointer

(MAP), which is set to the address of the register

that is to be updated. The next 8 bits are the data

which will be placed into register designated by the

MAP. To write multiple registers, keep CS low and

continue providing clocks on CCLK. End the read

transaction by setting CS high.

SDA

SCL

001000

ADDR

AD0

R/W

Start

ACK

DATA

1-8

ACK

DATA

1-8

ACK

Stop

Note: If operation is a write, this byte contains the Memory Address Pointer, MAP.

Note 1

Figure 5. Control Port Timing, Two-Wire Format

MAP

MSB

LSB

DATA

byte 1

byte n

R/W

MAP = Memory Address Pointer

ADDRESS

CHIP

CDIN

CCLK

0010000

Figure 6. Control Port Timing, SPI Format

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