XC2000 datasheet(29/729 Pages) INFINEON

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XC2000 Derivatives

Peripheral Units (Vol. 2 of 2)

The General Purpose Timer Units

Preliminary

User’s Manual

14-11

V1.0, 2007-06

GPT_X7, V2.0

Incremental Interface Mode

Incremental interface mode for the core timer T3 is selected by setting bitfield T3M in

B or 111B. In incremental interface mode, the two inputs

associated with core timer T3 (T3IN, T3EUD) are used to interface to an incremental

encoder. T3 is clocked by each transition on one or both of the external input pins to

provide 2-fold or 4-fold resolution of the encoder input.

Figure 14-7

Block Diagram of Core Timer T3 in Incremental Interface Mode

Bitfield T3I in control register T3CON selects the triggering transitions (see Table 14-3).

The sequence of the transitions of the two input signals is evaluated and generates count

pulses as well as the direction signal. So T3 is modified automatically according to the

speed and the direction of the incremental encoder and, therefore, its contents always

represent the encoder’s current position.

The interrupt request (T3IRQ) generation mode can be selected: In Rotation Detection

Mode (T3M = 110

B), an interrupt request is generated each time the count direction of

T3 changes. In Edge Detection Mode (T3M = 111

B), an interrupt request is generated

each time a count edge for T3 is detected. Count direction, changes in the count

direction, and count requests are monitored by status bits T3RDIR, T3CHDIR, and

T3EDGE in register T3CON.

MCB05394

Count

T3EUD

EDGE

RDIR

MUX

T3UD

T3UDE

Change

Detect

T3CH

DIR

T3M

Phase

Detect

T3R

T3IN

T3I

T3IRQ

Core

Timer T3

Toggle

Latch

T3OUT

T2/T4

Edge

Select

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