XC2000 datasheet(30/729 Pages) INFINEON

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XC2000 Derivatives

Peripheral Units (Vol. 2 of 2)

The General Purpose Timer Units

Preliminary

User’s Manual

14-12

V1.0, 2007-06

GPT_X7, V2.0

The incremental encoder can be connected directly to the XC2000 without external

interface logic. In a standard system, however, comparators will be employed to convert

the encoder’s differential outputs (such as A, A) to digital signals (such as A). This greatly

increases noise immunity.

Note: The third encoder output T0, which indicates the mechanical zero position, may

be connected to an external interrupt input and trigger a reset of timer T3 (for

example via PEC transfer from ZEROS).

Figure 14-8

Connection of the Encoder to the XC2000

For incremental interface operation, the following conditions must be met:

• Bitfield T3M must be 110

B or 111B.

• Both pins T3IN and T3EUD must be configured as input, i.e. the respective direction

control bits must be 0.

• Bit T3UDE must be 1 to enable automatic external direction control.

The maximum count frequency allowed in incremental interface mode depends on the

selected prescaler value. To ensure that a transition of any input signal is recognized

correctly, its level must be held high or low for a minimum number of module clock cycles

before it changes. This information can be found in Section 14.1.5.

Table 14-3

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.

MCS04372

Encoder

Controller

T3Input

Interrupt

Signal

Conditioning

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