CAP1214 datasheet(81/107 Pages) MICROCHIP

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Multiple Channel Capacitive Touch Sensor and LED Driver

Datasheet

SMSC CAP1214

Revision 1.0 (08-30-10)

DATASHEET

6.45

GPIO Input Register

The GPIO Input Register reflects the state of the LEDx / GPIOx pins. These bits are updated whenever

the pin state changes regardless of the operation of the pin. If a LEDx / GPIOx pin is configured as

an input (see Section 6.40), when a pin changes states, the GPIOx_STS bit is set. If the corresponding

interrupt enable bit is also set, an interrupt will be asserted.

6.46

LED Output Control Registers

The LED Output Control Registers control the output state of the LED pins when they are configured

as outputs (see Section 6.43, "LED / GPIO Direction Register") and are not linked to sensor inputs

(see Section 6.50, "Sensor LED Linking Register"). When these bits are set, the drive of the pin is

determined by the output type and the polarity controls (see Section 6.44, "LED / GPIO Output Type

The LED Polarity Control register will determine the non actuated state of the LED pins. The actuated

LED behavior is determined by the LED behavior controls (see Section 6.51, "LED Behavior

Registers").

6.46.1

LED Output Control 1

Bit 7 - LED8_DR - Determines whether the LED8 output is driven high or low. This LED cannot be

linked to a Capacitive Touch Sensor.

‘0’ (default) - The LED8 output is driven at the minimum duty cycle or is not actuated.

‘1’ - The LED8 output is high-Z or driven at the maximum duty cycle or is actuated.

Bit 6 - LED7_DR - Determines whether LED7 output is driven high or low.

Bit 5 - LED6_DR - Determines whether LED6 output is driven high or low.

Bit 4 - LED5_DR - Determines whether LED5 output is driven high or low.

Bit 3 - LED4_DR - Determines whether LED4 output is driven high or low.

Bit 2 - LED3_DR - Determines whether LED3 output is driven high or low.

Bit 1 - LED2_DR - Determines whether LED2 output is driven high or low.

Bit 0 - LED1_DR - Determines whether LED1 output is driven high or low.

Table 6.65 GPIO Input Register

ADDR

R/W

DEFAULT

72h

GPIO Input

GPIO8

GPIO7

GPIO6

GPIO5

GPIO4

GPIO3

GPIO2

GPIO1

00h

Table 6.66 LED Output Control Registers

ADDR

R/W

DEFAULT

73h

R/W

LED Output

Control 1

LED8_

LED7_

LED6_

LED5_

LED4_

LED3_

LED2_

LED1_

00h

74h

R/W

LED Output

Control 2

LED11_

LED10_

LED9_

00h

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