PS700

DS21760F-page 22

 2004 Microchip Technology Inc.

4.4.13

GPIOctrl – GPIO CONTROL REGISTER

REGISTER 4-5:

GPIOctrl: GPIO CONTROL REGISTER (ADDRESS 53 HEX/83 DECIMAL)

pp0OE0

IE1IE0

OUT1

OUT0

IN1

IN0

bit 7

bit 0

bit 7

pp0: Push-Pull Output IO0 bit

Setting this bit to a ‘1’, with bit OE0 set to a ‘1’, will configure the IO0 (NTC) pin as a push-pull

digital output. If pp0 is a ‘0’, with OE0 set to ‘1’, the IE0 is an open-drain output with a 300 kOhm

bit 6

OE0: Output Enable IO0 bit

Setting this bit to a ‘1’ will allow the PS700 to control NTC as either a push-pull (pp0 = 1) or

open-drain (pp0 = 0) output. If OE0 is a ‘0’, the NTC pin is tri-state (pp0 = 1) or pulled up to

bit 5

IE1: Input Enable IO1 bit

Setting this bit to a ‘1’ will enable IO1 (VC2) as a digital input. If IE1 is a ‘0’, the digital input

buffer on IO1 is powered down and IN1 will always read logic ‘0’.

bit 4

IE0: Input Enable IO0 bit

Setting this bit to a ‘1’ will enable IO0 (NTC) as a digital input. If IE0 is a ‘0’ the digital input buffer

on IO0 is powered down and IN0 will always read logic ‘0’.

bit 3

OUT1: Output Data GPIO1 bit

Setting this bit to a ‘0’ turns on the open-drain pull-down on IO1 (VC2) (forcing a logic ‘0’ on the

output). Setting this bit to a ‘1’ turns off the pull-down resistor.

bit 2

OUT0: Output Data GPIO0 bit

If OE0 is a ‘1’, the logic value of OUT0 is driven onto the IO0 (NTC) pin by the PS700.

bit 1

IN1: Input Data GPIO1 bit

Current logic state of the IO1 (VC2) pin (read-only).

bit 0

IN0: Input Data GPIO0 bit

Current logic state of the IO0 (NTC) (read-only).

Legend:

‘1’ = Bit is set

‘0’ = Bit is cleared

R = Reserved bit