WM8959
Pre-Production
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
6
5
4
GPIO1_IRQ_ENA
0b
GPIO1 IRQ Enable
0 = disabled
1 = enabled (GPIO1 input will generate IRQ)
GPIO1 Pull-Up Resistor Enable
0 = Pull-up disabled
GPIO1_PU
GPIO1_PD
0b
1 = Pull-up enabled (Approx 150kΩ)
GPIO1 Pull-Down Resistor Enable
0 = Pull-down disabled
0b
1 = Pull-down enabled (Approx 150kΩ)
GPIO1 Function Select
3:0
GPIO1_SEL
[3:0]
0000b
0000 = Input pin
0001 = Clock output (f=SYSCLK/OPCLKDIV)
0010 = Logic '0'
0011 = Logic '1'
0100 = PLL Lock output
0101 = Temperature OK output
0110 = SDOUT data output
0111 = IRQ output
1000 = MIC Detect
1001 = MIC Short Circuit Detect
1010 to 1111 = Reserved
R20 (14h)
15
GPIO4_DEB_ENA
GPIO4_IRQ_ENA
GPIO4_PU
0b
GPIO4 Input De-Bounce
GPIO3 and
GPIO4
0 = disabled (Not de-bounced)
1 = enabled (Requires MCLK input and TOCLK_ENA=1)
GPIO4 IRQ Enable
14
0b
0 = disabled
1 = enabled (GPIO4 input will generate IRQ)
GPIO4 Pull-Up Resistor Enable
0 = Pull-up disabled
13
0b
1 = Pull-up enabled (Approx 150kΩ)
GPIO4 Pull-Down Resistor Enable
0 = Pull-down disabled
12
GPIO4_PD
1b
1 = Pull-down enabled (Approx 150kΩ)
GPIO4 Function Select
11:8
GPIO4_SEL
[3:0]
0000b
0000 = Input pin
0001 = Clock output (f=SYSCLK/OPCLKDIV)
0010 = Logic '0'
0011 = Logic '1'
0100 = PLL Lock output
0101 = Temperature OK output
0110 = SDOUT data output
0111 = IRQ output
1000 = MIC Detect
1001 = MIC Short Circuit Detect
1010 to 1111 = Reserved
7
6
5
GPIO3_DEB_ENA
GPIO3_IRQ_ENA
GPIO3_PU
0b
0b
0b
GPIO3 Input De-Bounce
0 = disabled (Not de-bounced)
1 = enabled (Requires MCLK input and TOCLK_ENA=1)
GPIO3 IRQ Enable
0 = disabled
1 = enabled (GPIO3 input will generate IRQ)
GPIO3 Pull-Up Resistor Enable
0 = Pull-up disabled
1 = Pull-up enabled (Approx 150kΩ)
PP, May 2008, Rev 3.1
134
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
