XC2000 datasheet(101/729 Pages) INFINEON

101 / 729 page

XC2000 Derivatives

Peripheral Units (Vol. 2 of 2)

Analog to Digital Converter

Preliminary

User’s Manual

16-7

V1.0, 2007-06

ADC, UM_V0.1D6

16.1.5

Conversion Request Unit

The conversion request unit of each ADC kernel autonomously handles the generation

of conversion requests.

It contains three independent request sources that are connected to several modules to

trigger the start of a conversion. A request source defines the analog input channel to be

converted if a defined event occurs. For example, a trigger pulse from a timer unit

generating a PWM signal can start the conversion of a single input channel or a

programmed sequence of input channels.

Depending on the application, the request sources can be triggered by different events,

either issued by other modules or under SW control. As a consequence, there can be

two or more conversion requests pending at the same time. To allow the user to adapt

the request source mechanism to the application needs, the trigger capability, the

channel number(s) to be converted, and the priority can be individually programmed for

each request source.

An arbiter block regularly scans the request sources for pending conversion requests

and acts upon the conversion request with the highest priority. This conversion request

is forwarded to the converter to start the conversion of the requested channel.

Figure 16-3

Conversion Request Unit

The functional characteristics of the request sources are adapted to the most common

application requirements. In all request sources, a continuous operation or a single-shot

operation can be selected. For continuous operation, the programmed sequence of

conversions requests are continuously issued (once started), whereas in single-shot

mode, each sequence of conversion requests has to be explicitly started. The trigger for

a conversion request or a sequence can be handled under SW control or can be

ADC_request_handling

request control

request

source 1

(16-ch scan)

request

source 2

(4-stage queue)

request

source

arbiter

timer

unit(s)

external

request(s)

analog part

request

source 0

(1-stage queue)

ADC kernel

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