wm8940gefl-v Wolfson Microelectronics plc, wm8940gefl-v Datasheet - Page 62

• Manufacturer Part Number: wm8940gefl-v
• Description: Mono Codec With Speaker Driver
• Manufacturer: Wolfson Microelectronics plc

WM8940
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3-WIRE SERIAL CONTROL MODE
READBACK IN 3-WIRE MODE
Table 55 Control Interface
Figure 34 3-Wire Serial Control Interface
Figure 35 Alternative 3-Wire Serial Control Timing
Table 54 Mode is GPIO Control
Auto-incremental writes are supported in 2 wire and 3 wire modes. This is enabled by default.
In 3-wire mode, every rising edge of SCLK clocks in one data bit from the SDIN pin. A rising edge on
CSB/GPIO latches in a complete control word consisting of the last 16 bits.
The following two timing diagrams are also supported.
R8
GPIO
control
R9
Control
Interface
REGISTER
REGISTER
ADDRESS
ADDRESS
7
1
BIT
BIT
MODE_GPIO
AUTOINC
LABEL
LABEL
0
1
DEFAULT
DEFAULT
Selects MODE as a GPIO pin
0 = MODE is an input. MODE selects 2-
wire mode when low and 3-wire mode
when high.
1 = MODE can be an input or output
under the control of the GPIO control
register. Interface operates in 3-wire
mode regardless of what happens on the
MODE pin.
Auto-Incremental write enable
0=Auto-Incremental writes disabled
1=Auto-Incremental writes enabled
DESCRIPTION
DESCRIPTION
PD, Rev 4.2, April 2008
Production Data
62