WM8945ECSSLASHR datasheet(100/169 Pages) WOLFSON

100 / 169 page

WM8945

Production Data

PD, May 2011, Rev 4.1

100

Figure 41 Single Register Read from Specified Address

Figure 42 Multiple Register Write to Specified Address using Auto-increment

Figure 43 Multiple Register Read from Specified Address using Auto-increment

Figure 44 Multiple Register Read from Last Address using Auto-increment

Multiple Write and Multiple Read operations enable the host processor to access sequential blocks of

the data in the WM8945 register map faster than is possible with single register operations. The auto-

increment option is enabled when the AUTO_INC register bit is set. This bit is defined in Table 66.

Auto-increment is disabled by default.

3-WIRE (SPI) CONTROL MODE

The 3-wire control interface uses the CS

¯¯ , SCLK and SDA pins.

In 3-wire control mode, a control word consists of 32 bits. The first bit is the read/write bit (R/W),

which is followed by 15 address bits (A14 to A0) that determine which control register is accessed.

The remaining 16 bits (B15 to B0) are data bits, corresponding to the 16 bits in each control register.

In 3-wire mode, every rising edge of SCLK clocks in one data bit from the SDA pin. The data is

latched on the 32

nd falling edge of SCLK after 32 bits of data have been clocked into the device.

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

WM8945ECS/R Datasheet(PDF) 100 Page - Wolfson Microelectronics plc