XC2000 datasheet(57/110 Pages) INFINEON

57 / 110 page

XC2287 / XC2286 / XC2285

XC2000 Family Derivatives

Functional Description

Preliminary

Data Sheet

V0.91, 2007-02

Draft Version

With its maximum resolution of 2 system clock cycles, the GPT2 module provides

precise event control and time measurement. It includes two timers (T5, T6) and a

capture/reload register (CAPREL). Both timers can be clocked with an input clock which

is derived from the CPU clock via a programmable prescaler or with external signals. The

count direction (up/down) for each timer is programmable by software or may

additionally be altered dynamically by an external signal on a port pin (TxEUD).

Concatenation of the timers is supported via the output toggle latch (T6OTL) of timer T6,

which changes its state on each timer overflow/underflow.

The state of this latch may be used to clock timer T5, and/or it may be output on pin

T6OUT. The overflows/underflows of timer T6 can additionally be used to clock the

CAPCOM2 timers, and to cause a reload from the CAPREL register.

The CAPREL register may capture the contents of timer T5 based on an external signal

transition on the corresponding port pin (CAPIN), and timer T5 may optionally be cleared

after the capture procedure. This allows the XC228x to measure absolute time

differences or to perform pulse multiplication without software overhead.

The capture trigger (timer T5 to CAPREL) may also be generated upon transitions of

GPT1 timer T3’s inputs T3IN and/or T3EUD. This is especially advantageous when T3

operates in Incremental Interface Mode.

XC2000 Datasheet(PDF) 57 Page - Infineon Technologies AG