SIO1007 datasheet(80/108 Pages) MICROCHIP

80 / 108 page

SIO1007

DS00002020A-page 80

 2005 - 2015 Microchip Technology Inc.

18.4.50

CR33

CR33 can only be accessed in the configuration state and after the CSR has been initialized to 33H. CR33 is GPIO

Output Register and is used to select the output buffer of GP10-GP17.

18.4.51

CR34

CR34 can only be accessed in the configuration state and after the CSR has been initialized to 34H. CR34 is Alternate

Function Register 1. It is used to select the polarity IO_PME pin, and select alternate function on GP13 and GP14 pins.

TABLE 18-44: CR33

GPIO Output Type Register 1

Type: R/W

Default: 0XFF ON VTR POR

BIT NO.

BIT NAME

DESCRIPTION

GP10

The bits in this register are used to select the output buffer type of the

GP10-GP17 pins.

0=Push-pull

1=Open Drain

1GP11

2GP12

3GP13

4GP14

5GP15

6GP16

7GP17

TABLE 18-45: CR34

Alternate Function and IO_PME# Configuration Register

Type: R/W

Default: 0x01 on VTR POR

BIT NO.

BIT NAME

DESCRIPTION

IO_PME#

Buffer Select

The bits in this register are used to select the output buffer type of the

IO_PME# pin

0=Push-pull

1=Open Drain (default)

IO_PME# Polarity

select

This bit is used to select the polarity of the IO_PME# pin.

0=Non-Inverted

1=Inverted

Note:

Configuring this pin function with non-inverted polarity will give an

active low output signal. The output type can be either open drain

or push-pull. (See Bit 4).

CLKI32 Alternate

Function Select

0= The alternate function is determined by Bit[6] of this register (Bit[6] is

the GP13 Alternate Function Select bit). (default)

1=CLKI32

GP15 Alternate

Function Select

0=GPIO

1=CIRRX

GP16 Alternate

Function Select

0=GPIO

1=CIRTX

GP12 Alternate.

Function Select

0=GPIO

1=nIO_SMI

Note:

Selecting the nIO_SMI function with GP12 configured with non-

inverted polarity will give an active low output signal. The output

type can be programmed for open drain via CR33.

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