Advanced Information
WM8753L
REGISTER
ADDRESS
BIT
4:3
LABEL
DEFAULT
00
DESCRIPTION
R27 (1Bh)
GPIO
GPIO5M[1:0]
Configures GPIO5 pin. (2-wire interface
mode only)
00 = Input only.
Control (1)
01 = INT from interrupt controller.
10 = Drive low.
11 = Drive high.
2:0
GPIO4M[2:0]
000
Configures GPIO4 pin.
000 = Input only.
001 = unused.
010 = input only with pull-down.
011 = Input only with pull-up.
100 = Drive low.
101 = Drive high.
110 = SDOUT from control interface
111 = INT from interrupt controller
R28 (1Ch)
GPIO
Control (2)
8:6
5:3
GPIO3M[2:0]
000
000
Configures GPIO3 pin
000 = Input only.
001 to 011 Reserved.
100 = Drive low.
101 = Drive high.
110 = SDOUT from control interface.
111 = INT from interrupt controller.
GP2M[2:0]
Configures GP2/CLK2 pin when
CLK2EN=0
000 = Drive low.
001 = Drive high.
010 = SDOUT from control interface.
011 = INT from interrupt controller.
100 = ADC clock (=256 x fs)
101 = Hi-Fi DAC clock (=256 x fs)
110 = ADC clock divided by 2
111 = DAC clock divided by 2
2:0
GP1M[2:0]
000
Configures GP1/CLK1 pin when
CLK1EN=0
000 = Drive low.
001 = Drive high.
010 = SDOUT from control interface.
011 = INT from interrupt controller.
100 to 111 = reserved
Table 49 GPIO Control
Note:
GPIO5 must not be used in 3-wire interface mode. GPIO5 pin is shared with 3-wire interface CSB.
Enabling GPIO5 as an output will prevent 3-wire writes to the WM8753L.
AI Rev 3.1 June 2004
52
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
