SC18IM700_2

© NXP B.V. 2007. All rights reserved.

Product data sheet

Rev. 02 — 10 August 2007

11 of 22

NXP Semiconductors

SC18IM700

9.2.2.2

Input-only configuration

The input-only port configuration has no output drivers. It is a Schmitt triggered input that

also has a glitch suppression circuit.

9.2.2.3

Push-pull output configuration

The push-pull output configuration has the same pull-down structure as both the

open-drain and the quasi-bidirectional output modes, but provides a continuous strong

pull-up when the port latch contains a logic 1. The push-pull mode may be used when

more source current is needed from a port output. A push-pull port pin has a Schmitt

triggered input that also has a glitch suppression circuit.

Fig 13. Quasi-bidirectional output configuration

002aac076

2 SYSTEM

CLOCK

CYCLES

weak

strong

very

weak

PP

P

pin latch data

GPIOn

glitch rejection

input data

Fig 14. Input-only configuration

002aab884

GPIO pin

glitch rejection

input data

Fig 15. Push-pull output configuration

002aab885

strong

P

pin latch data

GPIO pin

glitch rejection

input data

N