MEC1322 datasheet(251/456 Pages) MICROCHIP

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DS00001719D-page 251

MEC1322

13:12 Mux Control

The Mux Control field determines the active signal function for a pin.

00 = GPIO Function Selected

01 = Signal Function 1 Selected

10 = Signal Function 2 Selected

11 = Signal Function 3 Selected

R/W

Note 20-5

VCC1_R

ESET

11 Polarity

0 = Non-inverted

1 = Inverted

When the Polarity bit is set to ‘1’ and the Mux Control bits are greater

than ‘00,’ the selected signal function outputs are inverted and Inter-

rupt Detection (int_det) sense defined in Table 20-8, "Edge Enable

and Interrupt Detection Bits Definition" is inverted. When the Mux

Control field selects the GPIO signal function (Mux = ‘00’), the Polar-

ity bit does not effect the output. Regardless of the state of the Mux

Control field and the Polarity bit, the state of the pin is always

reported without inversion in the GPIO input register.

R/W

Note 20-5

VCC1_R

ESET

10 Output GPIO Write Enable

Every GPIO has two mechanisms to set a GPIO data output: Output

GPIO Bit located in the GPIO Output Registers and the Alternative

GPIO data bit located in bit 16 of this register.

This control bit determines the source of the GPIO output.

0 = Alternative GPIO data write enabled

When this bit is zero the Alternative GPIO data write is enabled and

the Output GPIO is disabled.

1 = Output GPIO enable

When this bit is one the Alternative GPIO data write is disabled and

the Output GPIO is enabled.

Note:

See description in Section 20.4, "Accessing GPIOs".

R/W

Note 20-5

VCC1_R

ESET

9GPIO Direction

0 = Input

1 = Output

The GPIO Direction bit controls the buffer direction only when the

Mux Control field is ‘00’ selecting the pin signal function to be

GPIO. When the Mux Control field is greater than ‘00’ (i.e., a non-

GPIO signal function is selected) the GPIO Direction bit has no affect

and the selected signal function logic directly controls the pin direc-

tion.

R/W

Note 20-5

VCC1_R

ESET

Offset

See Note 20-5

Bits

Description

Type

Default

Reset

Event

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