C167CS datasheet(167/517 Pages) INFINEON

167 / 517 page

C167CS

Derivatives

Parallel Ports

User’s Manual

7-40

V2.0, 2000-07

Port 5 Digital Input Control

Port 5 pins may be used for both digital an analog input. By setting the respective bit in

from the pin. This is recommended when the pin is to be used as analog input, as it

reduces the current through the digital input stage and prevents it from toggling while the

(analog) input level is between the digital low and high thresholds. So the consumed

power and the generated noise can be reduced.

After reset all digital inputs are enabled.

Port 5 pins have a special port structure (see Figure 7-20), first because it is an input

only port, and second because the analog input channels are directly connected to the

pins rather than to the input latches.

P5DIDIS

Port 5 Digital Inp.Disable Reg.

SFR (FFA4H/D2H)

Reset Value: 0000H

9876

543210

P5D

.15

P5D

.14

P5D

.13

P5D

.12

P5D

.11

P5D

.10

P5D

Bit

Function

P5D.y

Port 5 Bit y Digital Input Control

P5D.y = 0:

Digital input stage connected to port line P5.y

P5D.y = 1:

Digital input stage disconnected from port line P5.y

When being read or used as alternate input this line

appears as ‘1’.

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