WM8235 datasheet(13/154 Pages) CIRRUS

13 / 154 page

WM8235

Rev 4.6

Figure 4 shows sequence of operations for performing a register write. Three pins, SCK, SDI and SEN

are used for the control interface. A 16-bit address (R/W, CS0, CS1, CS2, A11 to A0) is clocked in

through SDI, MSB first, followed by an 8

–bit data word (b7 to b0), also MSB first. Setting address bit

R/W to 0 indicates that the operation is a register write. The device ID bits (CS0 and CS1) indicate

which device is being written to on a shared control bus. A register write with CS2 set to 1 writes data

to all devices on the common bus. Each bit is latched on the rising edge of SCK. When the data has

been shifted into the device, a rising edge on the SEN pin transfers the data to the appropriate internal

CS2

CS1

(DSLCT2)

CS0

(DSLCT1)

DESCRIPTION

ID[1:0]

Indicated a device to write data

Writes data to all devices

Table 3 Device Identification

CS2

CS0

SDI

SCK

12-bit Control register address

8-bit control register data

SEN

A11

CS1

CS0

3bit device ID

R/W

Figure 4 Serial Interface Register Write

Figure 5 shows register read-back in serial mode. Read-back is initiated by writing to the serial bus as

described above but with address bit R/W set to 1, followed by an 8-bit dummy data word. Writing

address (A11 to A0) will cause the contents (B7 to B0) of corresponding register in the addressed

device to be output MSB first on pin SDO (on the following edge of SCK). In this mode, the CS2

CS0

SDI

SCK

12-bit Read back register address

8-bit outputl register data

SDO

SEN

Hi-Z

A11

CS1

CS0

3bit device ID

X: Don’t care

R/W

Figure 5 Serial Interface Register Read-back

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