XC2000 datasheet(39/112 Pages) INFINEON

39 / 112 page

XC2230L, XC2234L

XC2000 Family / Econo Line

Functional Description

Data Sheet

V1.3, 2015-02

3.7

Capture/Compare Unit (CC2)

The CAPCOM unit supports generation and control of timing sequences on up to

16 channels with a maximum resolution of one system clock cycle (eight cycles in

staggered mode). The CAPCOM unit is typically used to handle high-speed I/O tasks

such as pulse and waveform generation, pulse width modulation (PWM), digital to

analog (D/A) conversion, software timing, or time recording with respect to external

events.

Two 16-bit timers with reload registers provide two independent time bases for the

capture/compare register array.

The input clock for the timers is programmable to several prescaled values of the internal

system clock, or may be derived from an overflow/underflow of timer T6 in module GPT2.

This provides a wide range of variation for the timer period and resolution and allows

precise adjustments to the application specific requirements. In addition, external count

inputs allow event scheduling for the capture/compare registers relative to external

events.

The capture/compare register array contains 16 dual purpose capture/compare

registers, each of which may be individually allocated to either CAPCOM timer and

programmed for capture or compare function.

All registers have each one port pin associated with it which serves as an input pin for

triggering the capture function, or as an output pin to indicate the occurrence of a

compare event.

When a capture/compare register has been selected for capture mode, the current

contents of the allocated timer will be latched (‘captured’) into the capture/compare

generated. Either a positive, a negative, or both a positive and a negative external signal

transition at the pin can be selected as the triggering event.

The contents of all registers which have been selected for one of the five compare modes

are continuously compared with the contents of the allocated timers.

When a match occurs between the timer value and the value in a capture/compare

Table 9

Compare Modes

Function

Mode 0

Interrupt-only compare mode;

Several compare interrupts per timer period are possible

Mode 1

Pin toggles on each compare match;

Several compare events per timer period are possible

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