TC1796 Datasheet, PDF (60/134 Pages) Infineon Technologies AG – 32-Bit Single-Chip Microcontroller TriCore

TC1796
Functional Description
3.14.1 Functionality of GPTA0/GPTA1
Each of the General Purpose Timer Arrays (GPTA0 and GPTA1) 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 external or internal event. A GTC may be also used to control an external
port pin depending on 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 various external or internal events.
Input lines can be shared by an LTC and a GTC to trigger their programmed operation
simultaneously.
The following sections summarize the specific features of the GPTA units. The clock
signal f_GPTA is the input clock of the GPTA modules (max. 75 MHz in TC1796).
Clock Generation Unit
• Filter and Prescaler Cell (FPC)
– Six independent units
– Three basic operating modes:
Prescaler, Delayed Debounce Filter, Immediate Debounce Filter
– Selectable input sources:
Port lines, GPTA module clock, FPC output of preceding FPC cell
– Selectable input clocks:
GPTA module clock, prescaled GPTA module clock, DCM clock, compensated or
uncompensated PLL clock.
– f_GPTA/2 maximum input signal frequency in Filter Modes
• Phase Discriminator Logic (PDL)
– Two independent units
– Two operating modes (2 and 3 sensor signals)
Data Sheet
60
V1.0, 2008-04