C167CS datasheet(364/517 Pages) INFINEON

364 / 517 page

C167CS

Derivatives

The Analog/Digital Converter

User’s Manual

18-7

V2.0, 2000-07

Auto Scan Conversion Modes

These modes are selected by programming the mode selection field ADM in register

ADCON to ‘10B’ (single conversion) or to ‘11B’ (continuous conversion). Auto Scan

modes automatically convert a sequence of analog channels, beginning with the channel

specified in bit fields ADCH/ADX and ending with channel 0/channel 16, without

requiring software to change the channel number.

After starting the converter through bit ADST, the busy flag ADBSY will be set and the

channel specified in bit fields ADCH/ADX will be converted. After the conversion is

complete, the interrupt request flag ADCIR will be set and the converter will

automatically start a new conversion of the next lower channel. ADCIR will be set after

each completed conversion. After conversion of channel 0/channel 16 the current

sequence is complete.

In Single Conversion Mode the converter will automatically stop and reset bits

ADBSY and ADST.

In Continuous Conversion Mode the converter will automatically start a new sequence

beginning with the conversion of the channel specified in ADCH/ADX.

When bit ADST is reset by software, while a conversion is in progress, the converter will

complete the current sequence (including conversion of channel 0/channel 16) and then

stop and reset bit ADBSY.

Figure 18-3

Auto Scan Conversion Mode Example

# 2

Result of Channel:

# x

# 3

Write ADDAT

ADDAT Full

Conversion

of Channel..

Read of ADDAT;

Generate Interrupt

Request

# x

# 3

# 2

Interrupt Request

Overrun Error

# 2

# 1

Result Lost

MCA02241

# 3

# 1

# 0

ADDAT Full;

Channnel 0

# 0

# 3

# 2

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