CS4294SLASHCS4298 datasheet(35/66 Pages) CIRRUS

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CS4202

DS549PP2

4.19

GPIO Pin Polarity/Type Configuration Register (Index 4Eh)

GP[4:0]

GPIO Pin Configuration. This register defines the GPIO input polarity (0 = Active Low,

1 = Active High) when a GPIO pin is configured as an input. The GP[4:0] bits define the GPIO

output type (0 = CMOS, 1 = OPEN-DRAIN) when a GPIO pin is configured as an output. The

GC[4:0] bits in the GPIO Pin Configuration Register (Index 4Ch) define the GPIO pins as in-

puts or outputs. See Table 11 for the various GPIO configurations.

Default

FFFFh

After a Cold Reset or a modem Register Reset this register defaults to all 1’s. The upper 11 bits of this register al-

ways return ‘1’.

4.20

GPIO Pin Sticky Register (Index 50h)

GS[4:0]

GPIO Pin Sticky. This register defines the GPIO input type (0 = not sticky, 1 = sticky) when a

GPIO pin is configured as an input. The GPIO pin status of an input configured as “sticky” is

‘cleared’ by writing a ‘0’ to the corresponding bit of the GPIO Pin Status Register (Index 54h),

and by reset.

Default

0000h

After a Cold Reset or a modem Register Reset this register defaults to all 0’s, specifying “non-sticky”. “Sticky” is de-

fined as edge sensitive, “non-sticky” as level sensitive. The upper 11 bits of this register always return ‘0’.

D15

D14

D13

D12

D11

D10

11111111111

GP4

GP3

GP2

GP1

GP0

GCx GPx Function

Configuration

Output

CMOS Drive

Output

Open Drain

Input

Active Low

Input

Active High (default)

Table 11. GPIO Input/Output Configurations

D15

D14

D13

D12

D11

D10

00000000000

GS4

GS3

GS2

GS1

GS0

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