C167CS datasheet(361/517 Pages) INFINEON

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C167CS

Derivatives

The Analog/Digital Converter

User’s Manual

18-4

V2.0, 2000-07

Bitfields ADCH and ADX specify the analog input channel which is to be converted (first

channel of a conversion sequence in auto scan modes). Bitfield ADM selects the

operating mode of the A/D converter. A conversion (or a sequence) is then started by

setting bit ADST. Clearing ADST stops the A/D converter after a certain operation which

depends on the selected operating mode.

The busy flag (read-only) ADBSY is set, as long as a conversion is in progress.

The result of a conversion is stored in the result register ADDAT, or in register ADDAT2

for an injected conversion.

Note: Bitfields CHNR and CHX of register ADDAT are loaded by the ADC to indicate,

which channel the result refers to.

Bitfields CHNR and CHX of register ADDAT2 are loaded by the CPU to select the

analog channel, which is to be injected.

ADBSY

ADC Busy Flag

ADC is idle

A conversion is active.

ADWR

ADC Wait for Read Control

ADCIN

ADC Channel Injection Enable

ADCRQ

ADC Channel Injection Request Flag

ADSTC

ADC Sample Time Control (Defines the ADC sample time in a certain range)

00:

tBC × 8

01:

tBC × 16

10:

tBC × 32

11:

tBC × 64

ADCTC

ADC Conversion Time Control (Defines the ADC basic conversion clock

fBC)

00:

fBC = fCPU / 4

01:

fBC = fCPU / 2

10:

fBC = fCPU / 16

11:

fBC = fCPU / 8

1) The two groups of channels are handled independently. Standard channels AN15 … AN0 are selected with

ADCH = FH … 0H and ADX = ‘0’, extension channels AN23 … AN16 are selected with ADCH = 7H … 0H and

ADX = ‘1’.

2) Bit ADX is available only after the execution of instruction EINIT. Before EINIT bit ADCON.6 controls

production testmodes and must remain cleared.

Bit

Function

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