WM8281ECSSLASHR datasheet(295/392 Pages) CIRRUS

295 / 392 page

WM8281

Rev 4.0

295

4-WIRE (SPI) CONTROL MODE

The 4-wire (SPI) Control Interface mode is supported on CIF1 only, and uses the corresponding SS

¯¯ ,

SCLK, MOSI and MISO pins.

The MISO output pin can b

e configured as CMOS or ‘Wired OR’, as described in Table 113. In CMOS

mode, MISO

is driven low when not outputting register data bits. In ‘Wired OR’ mode, MISO is

undriven (high impedance) when not outputting register data bits.

In Write operations (R/W=0), all MOSI bits are driven by the controlling device.

In Read operations (R/W=1), the MOSI pin is ignored following receipt of the valid register address.

MISO is driven by the WM8281.

Continuous read and write modes enable multiple register operations to be scheduled faster than is

possible with single register operations. The auto-increment function supports selectable address

increments for each successive register access. This function is controlled using the SPI_AUTO_INC

When auto-increment is enabled, the WM8281 will increment the register address at the end of the

sequences illustrated below, and every 16 clock cycles thereafter, for as long as SS

¯¯ is held low and

SCLK is toggled. Successive data words can be input/output every 16 clock cycles.

The 4-wire (SPI) protocol is illustrated in Figure 79 and Figure 80.

A30

MOSI

SCLK

31-bit control register address

16-bit control register data

R/W

A29

B14

B15

16-bit padding

Figure 79 Control Interface 4-wire (SPI) Register Write

A30

MOSI

SCLK

31-bit control register address

16-bit control register data

MISO

R/W

A29

B14

B15

16-bit padding

Figure 80 Control Interface 4-wire (SPI) Register Read

WM8281ECS/R Datenblatt(PDF) 295 Page - Cirrus Logic

WM8281ECS/R Datenblatt(HTML) 295 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datenblatt Download

Link URL