MEC1322 datasheet(250/456 Pages) MICROCHIP

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MEC1322

DS00001719D-page 250

 2014 - 2015 Microchip Technology Inc.

20.8

Pin Control Registers

Two Pin Control Registers are implemented for each GPIO. The Pin Control Register format is described in Section

20.8.1, "Pin Control Register," on page 250.

The Pin Control Register 2 format is described in Section 20.8.2, "Pin

Control Register 2," on page 253. Pin Control Register address offsets and defaults are defined in Table 20-5, “Pin

Control Registers,” on page 245.

20.8.1

PIN CONTROL REGISTER

Note:

The following GPIOs that do not exist in the 128-pin package are configured as inputs and grounded in the

package. Firmware should not attempt to turn those GPIOs into outputs and drive them high, or excessive

current will be consumed.

• GPIO067

• GPIO055

• GPIO210

• GPIO200

• GPIO202

• GPIO201

• GPIO203

• GPIO204

The following GPIOs that do not exist in the 128-pin package are not connected (NC) in the package. These

GPIOs should be configured as inputs and the internal pull-down should be enabled.

• GPIO211

• GPIO123

Offset

See Note 20-5

Bits

Description

Type

Default

Reset

Event

31:25 RESERVED

RES

24 GPIO input from pad

On reads, Bit [24] reflects the state of GPIO input from the pad

regardless of setting of Bit [10].

Note:

This bit is forced high when the selected power well is off

as selected by the Power Gating Signal bits. See bits[3:2].

Note 20-5

VCC1_R

ESET

23:17 RESERVED

RES

16 Alternative GPIO data

If enabled by the Output GPIO Write Enable bit, the Alternative GPIO

data bit determines the level on the GPIO pin when the pin is config-

ured for the GPIO output function.

On writes:

If enabled via the Output GPIO Write Enable

0: GPIO[x] out = ‘0’

1: GPIO[x] out = ‘1’

Note:

If disabled via the Output GPIO Write Enable then the

GPIO[x] out pin is unaffected by writing this bit.

On reads:

Bit [16] returns the last programmed value, not the value on the pin.

R/W

Note 20-5

VCC1_R

ESET

15:14 RESERVED

RES

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