Datasheet

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TLV320AIC34
SLAS538A – OCTOBER 2007 – REVISED NOVEMBER 2007
Page 0 / Register 99: GPIO2_x Control Register
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7 – D4 R/W 0000 GPIO2_x Output Control
0000: GPIO2_x is disabled.
0001: Reserved. Do not write this sequence to these register bits.
0010: GPIO2_x output = jack/headset detect interrupt (interrupt polarity: active-high. Typical interrupt
duration: 1.75 ms)
0011: GPIO2_x = general-purpose input
0100: GPIO2_x = general-purpose output
0101 – 0111: GPIO2_x input = digital microphone input, data sampled on clock rising and falling edges
1000: GPIO2_x = bit clock for audio serial data bus (programmable as input or output)
1001: GPIO2_x output = headset detect OR button-press interrupt
1010: GPIO2_x output = headset detect OR button press OR short-circuit detect OR AGC noise-detect
interrupt
1011: GPIO2_x output = short-circuit detect OR AGC noise-detect interrupt
1100: GPIO2_x output = headset detect OR button press or short-circuit detect interrupt
1101: GPIO2_x output = short-circuit detect interrupt
1110: GPIO2_x output = AGC noise-detect interrupt
1111: GPIO2_x output = button-press/hookswitch interrupt
D3 R/W 0 GPIO2_x General-Purpose Output Value
0: GPIO2_x_x outputs a logic-low level.
1: GPIO2_x outputs a logic-high level.
D2 R 0 GPIO2_x General-Purpose Input Value
0: A logic-low level is input to GPIO2_x.
1: A logic-high level is input to GPIO2_x.
D1 R/W 0 GPIO2_x Interrupt Duration Control
0: GPIO2_x interrupt occurs as a single active-high pulse of typical 2-ms duration.
1: GPIO2_x interrupt occurs as continuous pulses until the interrupt flags register (register 96) is read by
the host.
D0 R 0 Reserved. Do not write to this register bit.
Page 0 / Register 100: Additional GPIO Control Register A
READ/ RESET
BIT DESCRIPTION
WRITE VALUE
D7 – D6 R/W 00 SDA Terminal Control
(1)
The SDA terminal hardware includes pulldown capability only (open-drain NMOS), so an external pullup
resistor is required when using this terminal, even in GPIO mode.
00: SDA terminal is not used as general-purpose I/O.
01: SDA terminal used as general-purpose input
10: SDA terminal used as general-purpose output
11: Reserved. Do not write this sequence to these register bits.
D5 R/W 0 SDA General-Purpose Output Control
(1)
0: SDA driven to logic-low when used as general-purpose output
1: SDA driven to logic-high when used as general-purpose output (requires external pullup resistor)
D4 R 0 SDA General-Purpose Input Value
(1)
0: SDA detects a logic-low when used as general-purpose input.
1: SDA is detects a logic-high when used as general-purpose input.
D3 – D2 R/W 00 SCL Terminal Control
(1)
The SCL terminal hardware includes pulldown capability only (open-drain NMOS), so an external pullup
resistor is required when using this terminal, even in GPIO mode.
00: SCL terminal is not used as general-purpose I/O.
01: SCL terminal used as general-purpose input
10: SCL terminal used as general-purpose output
11: Reserved. Do not write this sequence to these register bits.
D1 R/W 0 SCL General-Purpose Output Control
(1)
0: SCL driven to logic-low when used as general-purpose output
1: SCL driven to logic-high when used as general-purpose output (requires external pullup resistor)
D0 R 0 SCL General-Purpose Input Value
(1)
0: SCL detects a logic-low when used as general-purpose input.
1: SCL detects a logic-high when used as general-purpose input.
(1) The control bits in register 100 are only valid in SPI mode, when SELECT = 1.
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