wm8953 Wolfson Microelectronics plc, wm8953 Datasheet - Page 51
wm8953
Manufacturer Part Number
wm8953
Description
Low Power Stereo Adc With Pll And Tdm Interface Low Power Stereo Adc With Pll And Tdm Interface
Manufacturer
Wolfson Microelectronics plc
Datasheet
1.WM8953.pdf
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Production Data
SERIAL DATA OUTPUT (REGISTER READBACK)
The GPIO pins can be configured to output serial data during register readback in 3-wire (open-drain)
or 4-wire mode. The readback mode is configured using the register bits RD_3W_ENA and
MODE_3W4W as described in Table 31.
Setting the RD_3W_ENA bit to 1 enables 3-wire readback using the SDIN pin in open-drain mode.
Setting the RD_3W_ENA bit to 0 requires the use of a GPIO pin as SDOUT. To enable SDOUT on a
GPIO pin, the following register settings are required:
The register fields used to configure SDOUT on the GPIO pins are described in Table 31. Refer to
“Control Interface” for more details of 3-wire and 4-wire interfacing.
Table 31 GPIO 3-Wire Readback Enable
R22 (16h)
REGISTER
ADDRESS
•
•
•
•
AIF_TRIS = 0
GPIOn_SEL = 0110 for the selected SDOUT output pin
GPIOn_PU = 0 for the selected SDOUT output pin
GPIOn_PD = 0 for the selected SDOUT output pin
15
14
BIT
RD_3W_ENA
MODE_3W4W
LABEL
1b
0b
DEFAULT
3- / 4-wire readback configuration
1 = 3-wire mode
0 = 4-wire mode, using GPIO pin
3-wire mode
4-wire mode
0 = push 0/1
1 = open-drain
0 = push 0/1
1 = wired-OR
DESCRIPTION
PD, January 2009, Rev 4.0
WM8953
51
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