wm8903 Wolfson Microelectronics plc, wm8903 Datasheet - Page 92

• Manufacturer Part Number: wm8903
• Description: Ultra Low Power Codec For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

WM8903
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BCLK is the default function of GPIO5. This may be input or output. Note that, when BCLK is
enabled on this pin (GP5_FN = 1h), the other GPIO control fields for this pin have no effect. When
BCLK is not enabled on this pin (GP5_FN ≠ 1h), the WM8903 uses the MCLK input as the Bit Clock.
See “Digital Audio Interface” for further details.
R116 (74h)
GPIO Control
1
R117 (75h)
GPIO Control
2
REGISTER
ADDRESS
13:8
13:8
BIT
7
6
5
4
3
2
1
0
7
GP1_FN[5:0]
GP1_DIR
GP1_OP_CFG
GP1_IP_CFG
GP1_LVL
GP1_PD
GP1_PU
GP1_INTMODE
GP1_DB
GP2_FN[5:0]
GP2_DIR
LABEL
DEFAULT
00_0000
00_0000
1
0
1
0
1
0
0
0
1
GPIO 1 Pin Function select
00h = GPIO output
01h = Reserved
02h = IRQ output
03h = GPIO input
04h = MICBIAS Current detect
05h = MICBIAS Short Circuit detect
06h = DMIC_LR Clock output
07h to 3Fh = Reserved
GPIO Pin Direction
0 = Output
1 = Input
Output pin configuration
0 = CMOS
1 = Open-drain
Input pin configuration
0 = Active low
1 = Active high
GPIO Output Level
(when GP1_FN = 00000)
0 = Logic 0
1 = Logic 1
GPIO Pull-Down Enable
0 = Pull-down disabled
1 = Pull-down enabled (Approx 100kΩ)
GPIO Pull-Up Enable
0 = Pull-up disabled
1 = Pull-up enabled (Approx 100kΩ)
GPIO Interrupt Mode
0 = Level triggered
1 = Edge triggered
GPIO de-bounce
0 = GPIO is not debounced
1 = GPIO is debounced
GPIO 2 Pin Function select
00h = GPIO output
01h = Reserved
02h = IRQ output
03h = GPIO input
04h = MICBIAS Current detect
05h = MICBIAS Short Circuit detect
06h = DMIC_DAT Data input
07h to 3Fh = Reserved
GPIO Pin Direction
0 = Output
1 = Input
PP, Rev 3.1, August 2009
DESCRIPTION
Pre-Production
92