GPIOs and LED Drivers

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9

REGISTER BIT

DESCRIPTION

VALUE

FUNCTION

0

An interrupt has occurred on at least one interrupt enabled input port.

D7

Interrupt Status

Flag (Read-Only)

1*

No interrupt has occurred on an interrupt enabled input port.

0

Transition has occurred on an input port.

D6

Transition Flag

(Read-Only)

1*

No transition has occurred on an input port.

D5

Reserved

0

Reserved.

D4, D3, D2

Blink Prescaler Bits

0/1

See Table 9 for blink frequency setting.

0*

RST does not reset PWM/blink counters.

D1

RST Timer

1

RST resets PWM/blink counters.

0*

RST does not reset registers to power-on-reset state.

D0

RST POR

1

RST resets registers to power-on-reset state.

Table 3. Configuration Register (0x26)

*Default state.

REGISTER BIT

DESCRIPTION

VALUE

FUNCTION

0

Enables the bus timeout feature.

D7

Bus Timeout

1*

Disables the bus timeout feature.

D6, D5, D4

Reserved

0

Reserved.

0

Sets P3 to output the oscillator.

D3

P3/OSCOUT

1*

Sets P3 as a GPIO controlled by register 0x03.

0

Sets P2 as the oscillator input.

D2

P2/OSCIN

1*

Sets P2 as a GPIO controlled by register 0x02.

0

Sets P1 as the interrupt output.

D1

P1/INT Output

1*

Sets P1 as a GPIO controlled by register 0x01.

D0

Input Transition

0

Set to 0 on power-up for proper transition detection.

Table 4. Configuration Register (0x27)

*Default state.