C167CS datasheet(237/517 Pages) INFINEON

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C167CS

Derivatives

The General Purpose Timer Units

User’s Manual

10-9

V2.0, 2000-07

Timer 3 in Incremental Interface Mode

Incremental Interface mode for the core timer T3 is selected by setting bit field T3M in

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 which gives 2-fold or 4-fold

resolution of the encoder input.

Figure 10-6

Block Diagram of Core Timer T3 in Incremental Interface Mode

Bitfield T3I in control register T3CON selects the triggering transitions (see Table 10-6).

In this mode 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 its contents

therefore always represent the encoder’s current position.

Table 10-6

GPT1 Core Timer T3 (Incremental Interface Mode) Input Edge Selection

T3I

Triggering Edge for Counter Increment/Decrement

0 0 0

None. Counter T3 stops

0 0 1

Any transition (rising or falling edge) on T3IN

0 1 0

Any transition (rising or falling edge) on T3EUD

0 1 1

Any transition (rising or falling edge) on any T3 input (T3IN or T3EUD)

1 X X

Reserved. Do not use this combination

Edge

Select

Timer T3

XOR

MUX

T3EUD

T3UDE

MCB04000B

T3U

T3l

T3IN

T3OTL

Interrupt

Request

T3OUT

Phase

Detect

T3OE

T3R

Up/

Down

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