C167CS datasheet(360/517 Pages) INFINEON

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C167CS

Derivatives

The Analog/Digital Converter

User’s Manual

18-3

V2.0, 2000-07

18.1

Mode Selection and Operation

The analog input channels AN15 … AN0 are alternate functions of Port 5 which is an

input-only port. The Port 5 lines may either be used as analog or digital inputs. For pins

that shall be used as analog inputs it is recommended to disable the digital input stage

via register P5DIDIS. This avoids undesired cross currents and switching noise while the

(analog) input signal level is between

VIL and VIH.

The analog input channels AN23 … AN16 are alternate functions of PORT1 which is an

IO port. The port lines P1L.7-0 may either be used as analog inputs or digital IOs. For

pins that shall be used as analog inputs it is recommended to disable the digital input

stage via register P1DIDIS. This avoids undesired cross currents and switching noise

while the (analog) input signal level is between

VIL and VIH.

The functions of the A/D converter are controlled by the bit-addressable A/D Converter

Control Register ADCON. Its bitfields specify the analog channel to be acted upon, the

conversion mode, and also reflect the status of the converter.

ADCON

ADC Control Register

SFR (FFA0H/D0H)

Reset Value: 0000H

98765

43210

ADCTC

ADSTC

CRQ

CIN

BSY

ADX

ADM

ADCH

rwh

Bit

Function

ADCH

ADC Analog Channel Input Selection

Selects the (first) ADC channel which is to be converted.

Bit ADX determines if ADCH selects a standard or extension channel.1)

ADM

ADC Mode Selection

00:

Fixed Channel Single Conversion

01:

Fixed Channel Continuous Conversion

10:

Auto Scan Single Conversion

11:

Auto Scan Continuous Conversion

ADX

ADC Extension Channel Control2)

ADCH selects the standard channels AN15 … AN0

ADCH selects the extension channels AN23 … AN16

ADST

ADC Start Bit

Stop a running conversion

Start conversion(s)

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