XC2000 datasheet(45/647 Pages) INFINEON

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XC2000 Derivatives

System Units (Vol. 1 of 2)

Architectural Overview

Preliminary

User’s Manual

2-17

V1.0, 2007-06

ArchitectureX2K, V1.0

instructions (BFLDL and BFLDH) to write to any number of bits in either byte of an

SFR without disturbing the non-addressed byte and the unselected bits.

• Reserved Bits: Some of the bits which are contained in the XC2000’s SFRs are

marked as ‘Reserved’. User software should never write ‘1’s to reserved bits. These

bits are currently not implemented and may be used in future products to invoke new

functions. In that case, the active state for those new functions will be ‘1’, and the

inactive state will be ‘0’. Therefore writing only ‘0’s to reserved locations allows

portability of the current software to future devices. After read accesses, reserved bits

should be ignored or masked out.

Capture/Compare Unit (CAPCOM2)

The CAPCOM units support generation and control of timing sequences on up to

16 channels with a maximum resolution of 1 system clock cycle (8 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 (PMW), Digital to Analog (D/A)

conversion, software timing, or time recording relative to external events.

Two 16-bit timers (T7/T8) with reload registers provide two independent time bases for

each capture/compare register.

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 for CAPCOM timer T7 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 T7 or T8

and programmed for capture or compare function.

All registers of each module 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.

XC2000 Datasheet(PDF) 45 Page - Infineon Technologies AG