WM8904 Datasheet, PDF (171/188 Pages) Wolfson Microelectronics plc – Ultra Low Power CODEC for Portable Audio Applications

Pre-Production
REGISTER BIT
ADDRESS
R121 (79h)
5
GPIO
Control 1
4
LABEL
GPIO1_PU
GPIO1_PD
3:0
GPIO1_SEL
[3:0]
Register 79h GPIO Control 1
DEFAULT
DESCRIPTION
0
1
0100
GPIO1 pull-up resistor enable
0 = pull-up disabled
1 = pull-up enabled
GPIO1 pull-down resistor enable
0 = pull-down disabled
1 = pull-down enabled
GPIO1 Function Select
0000 = Input pin
0001 = Clock output (f=SYSCLK/OPCLKDIV)
0010 = Logic '0'
0011 = Logic '1'
0100 = IRQ (default)
0101 = FLL Lock
0110 = Mic Detect
0111 = Mic Short
1000 = DMIC clock out
1001 = FLL Clock Output
1010 to 1111 = Reserved
REGISTER
ADDRESS
R122 (7Ah)
GPIO
Control 2
BIT
LABEL
DEFAULT
DESCRIPTION
5
GPIO2_PU
4
GPIO2_PD
3:0 GPIO2_SEL [3:0]
0
1
0000
GPIO2 pull-up resistor enable
0 = pull-up disabled
1 = pull-up enabled
GPIO2 pull-down resistor enable
0 = pull-down disabled
1 = pull-down enabled
GPIO2 Function Select
0000 = Input pin (default)
0001 = Clock output (f=SYSCLK/OPCLKDIV)
0010 = Logic '0'
0011 = Logic '1'
0100 = IRQ
0101 = FLL Lock
0110 = Mic Detect
0111 = Mic Short
1000 = DMIC clock out
1001 = FLL Clock Output
1010 to 1111 = Reserved
Register 7Ah GPIO Control 2
WM8904
REFER TO
General Purpose
Input/Output
(GPIO)
General Purpose
Input/Output
(GPIO)
General Purpose
Input/Output
(GPIO)
REFER TO
General Purpose
Input/Output
(GPIO)
General Purpose
Input/Output
(GPIO)
General Purpose
Input/Output
(GPIO)
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PP, Rev 3.3, September 2012
171