CS5535 Datasheet, PDF (237/555 Pages) National Semiconductor (TI) – Geode™ CS5535 I/O Companion Multi-Function South Bridge

ACC Register Descriptions (Continued)
Bit Name
31 GPIO_EN
30 INT_EN
29 WU_INT_EN
28:22
21
RSVD
INT_FLAG
20 WU_INT_FLAG
19:0 PIN_STS
ACC_GPIO_STATUS Bit Descriptions
Description
GPIO Enable. This bit determines if the codec GPIO pin data is sent out in slot 12 of
the serial output stream.
0: Send 0s and tag slot 12 as invalid.
1: Send GPIO pin data and tag slot valid.
Codec GPIO Interrupt Enable. Allow a codec GPIO interrupt to set the codec GPIO
interrupt flag and generate an IRQ.
0: Disable.
1: Enable.
A GPIO interrupt is defined by serial data in slot 12, bit 0
Codec GPIO Wakeup Interrupt Enable. Allow a codec GPIO wakeup interrupt to set
the codec GPIO wakeup interrupt flag and generate an IRQ.
0: Disable.
1: Enable.
A codec GPIO wakeup interrupt is defined as a 0-to-1 transition of AC_S_IN or
AC_S_IN2 while the codec is powered down. This bit can only be set after the codec(s)
are powered down (See Audio Driver Power-up/down Programming Model on
page 90).
Reserved. Reads return 0.
Codec GPIO Interrupt Flag (Read to Clear). If the GPIO interrupt is enabled (bit 30 =
1) then this flag is set upon a codec GPIO interrupt event (serial data in slot 12, bit 0 =
1), and an IRQ is generated.
Codec GPIO Wakeup Interrupt Flag (Read to Clear). If the GPIO wakeup interrupt is
enabled (bit 29 = 1), then this flag is set when a GPIO wakeup interrupt occurs, and an
IRQ is generated.
Codec GPIO Pin Status (Read Only). This is the GPIO pin status that is received from
the codec in slot 12 of the serial input stream. This is updated every time slot 12 of the
input stream is tagged valid.
Note: All 20 bits of input slot 12 are visible in this register, including reserved bits
within slot 12.
5.3.2.2 Codec GPIO Control Register (ACC_GPIO_CNTL)
ACC I/O Offset 04h
Type
R/W
Reset Value
00000000h
ACC_GPIO_CNTL Register Map
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RSVD
PIN_DATA
Bit
31:20
Name
RSVD
ACC_GPIO_CNTL Bit Descriptions
Description
Reserved. Reads return 0.
Revision 0.8
237
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