ADAU1761BCPZ-R7 datasheet(82/93 Pages) AD

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ADAU1761

Rev. C | Page 81 of 92

R48 to R51: GPIO Pin Control, 16,582 to 16,585 (0x40C6 to 0x40C9)

The GPIO pin control register sets the functionality of each GPIO pin as shown in Table 79. The GPIO functions use the same pins as the

serial port and must be enabled in the serial data/GPIO pin configuration register (Address 0x40F4). When the GPIO pins are set to

I2C/SPI port control mode, the pins are set through writes to memory locations described in Table 32. The value of the optional internal

pull-up is nominally 250 kΩ.

The output CRC error and output watchdog error settings are sticky, that is, once set, they remain set until the ADAU1761 is reset.

Address

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0x40C6

Reserved

GPIO0[3:0]

0x40C7

Reserved

GPIO1[3:0]

0x40C8

Reserved

GPIO2[3:0]

0x40C9

Reserved

GPIO3[3:0]

Table 79. GPIO Pin Functionality Bit Settings

GPIOx[3:0] Bits

GPIO Pin Function

0000

Input without debounce (default)

0001

Input with debounce (0.3 ms)

0010

Input with debounce (0.6 ms)

0011

Input with debounce (0.9 ms)

0100

Input with debounce (5 ms)

0101

Input with debounce (10 ms)

0110

Input with debounce (20 ms)

0111

Input with debounce (40 ms)

1000

Input controlled by I2C/SPI port

1001

Output set by I2C/SPI port, with pull-up

1010

Output set by I2C/SPI port, no pull-up

1011

Output set by DSP core, with pull-up

1100

Output set by DSP core, no pull-up

1101

Reserved

1110

Output CRC error (sticky)

1111

Output watchdog error (sticky)

Table 80. GPIO Pin Control Registers

Address

Decimal

Hex

Bit Name

Description

R48

16,582

0x40C6

GPIO0[3:0]

GPIO 0 pin function (see Table 79)

R49

16,583

0x40C7

GPIO1[3:0]

GPIO 1 pin function (see Table 79)

R50

16,584

0x40C8

GPIO2[3:0]

GPIO 2 pin function (see Table 79)

R51

16,585

0x40C9

GPIO3[3:0]

GPIO 3 pin function (see Table 79)

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