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Fig 11. Open drain output.
5.4 Input-only configuration
The input port configuration is shown in
has a glitch suppression circuit.
(Please refer to the P89LPC938 data sheet, Dynamic characteristics for glitch filter
specifications).
Fig 12. Input only.
5.5 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.
The push-pull port configuration is shown in
A push-pull port pin has a Schmitt-triggered input that also has a glitch suppression
circuit.
(Please refer to the P89LPC938 data sheet, Dynamic characteristics for glitch filter
specifications).
User manual
port latch
data
input
data
Figure
input
data
glitch rejection
Figure
Rev. 03 — 7 June 2005
UM10119
P89LPC938 User manual
port
pin
glitch rejection
002aaa915
12. It is a Schmitt-triggered input that also
port
pin
002aaa916
13.
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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