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C167CS

Derivatives

The General Purpose Timer Units

User’s Manual

10-34

V2.0, 2000-07

GPT2 Capture/Reload Register CAPREL in Capture Mode

This 16-bit register can be used as a capture register for the auxiliary timer T5. This

mode is selected by setting bit T5SC = ‘1’ in control register T5CON. Bit CT3 selects the

external input pin CAPIN or the input pins of timer T3 as the source for a capture trigger.

Either a positive, a negative, or both a positive and a negative transition at pin CAPIN

can be selected to trigger the capture function, or transitions on input T3IN or input

T3EUD or both inputs T3IN and T3EUD. The active edge is controlled by bit field CI in

T5I (see Table 10-14).

The maximum input frequency for the capture trigger signal at CAPIN is

fCPU / 8. To

ensure that a transition of the capture trigger signal is correctly recognized, its level

should be held for at least 4

fCPU cycles before it changes.

Figure 10-22 GPT2 Register CAPREL in Capture Mode

When the timer T3 capture trigger is enabled (CT3 = ‘1’) register CAPREL captures the

contents of T5 upon transitions of the selected input(s). These values can be used to

measure T3’s input signals. This is useful e.g. when T3 operates in incremental interface

mode, in order to derive dynamic information (speed acceleration) from the input signals.

Auxiliary Timer T5

Edge

Select

MCB02044B

Interrupt

Request

CAPIN

T5SC

T5CLR

Input

Clock

Up/Down

Interrupt

Request

CAPREL Register

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