TC1765T datasheet(32/88 Pages) INFINEON

32 / 88 page

TC1765

Data Sheet

V1.2, 2002-12

Preliminary

The General Purpose Timer Array (GPTA) provides a set of hardware modules required

for high speed digital signal processing:

• Filter and Prescaler Cells (FPC) support input noise filtering and prescaler operation.

• Phase Discrimination Logic units (PDL) decode the direction information output by a

rotation tracking system.

• Duty Cycle Measurement Cells (DCM) provide pulse width measurement capabilities.

• A Digital Phase Locked Loop unit (PLL) generates a programmable number of GPTA

module clock ticks during an input signal’s period.

• Global Timer units (GT) driven by various clock sources are implemented to operate

as a time base for the associated “Global Timer Cells”.

• Global Timer Cells (GTC) can be programmed to capture the contents of a Global

Timer on an event that occurred at an external port pin or at an internal FPC output.

A GTC may be also used to control an external port pin with the result of an internal

compare operation. GTCs can be logically concatenated to provide a common

external port pin with a complex signal waveform.

• Local Timer Cells (LTC) operating in Timer, Capture, or Compare Mode may be also

logically tied together to drive a common external port pin with a complex signal

waveform. LTCs — enabled in Timer Mode or Capture Mode — can be clocked or

triggered by

– A prescaled GPTA module clock,

– An FPC, PDL, DCM, PLL, or GTC output signal line,

– An external port pin.

Some input lines driven by processor I/O pads may be shared by a LTC and a GTC cell

to trigger their programmed operation simultaneously.

The following list summarizes all blocks supported:

Clock Generation Unit:

• Filter and Prescaler Cell (FPC):

– Six independent units

– Three operating modes (Prescaler, Delayed Debounce Filter, Immediate Debounce

Filter)

–

fGPTA down-scaling capability

–

fGPTA/2 maximum input signal frequency in Filter Mode

• Phase Discriminator Logic (PDL):

– Two independent units

– Two operating modes (2 and 3 sensor signals)

–

fGPTA/4 maximum input signal frequency in 2-sensor mode, fGPTA/6 maximum input

signal frequency in 3-sensor mode

• Duty Cycle Measurement (DCM):

– Four independent units

– 0 - 100% margin and time-out handling

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