XC2230L datasheet(44/112 Pages) INFINEON

44 / 112 page

XC2230L, XC2234L

XC2000 Family / Econo Line

Functional Description

Data Sheet

V1.3, 2015-02

3.9

General Purpose Timer (GPT12E) Unit

The GPT12E unit is a very flexible multifunctional timer/counter structure which can be

used for many different timing tasks such as event timing and counting, pulse width and

duty cycle measurements, pulse generation, or pulse multiplication.

The GPT12E unit incorporates five 16-bit timers organized in two separate modules,

GPT1 and GPT2. Each timer in each module may either operate independently in a

number of different modes or be concatenated with another timer of the same module.

Each of the three timers T2, T3, T4 of module GPT1 can be configured individually for

one of four basic modes of operation: Timer, Gated Timer, Counter, and Incremental

Interface Mode. In Timer Mode, the input clock for a timer is derived from the system

clock and divided by a programmable prescaler. Counter Mode allows timer clocking in

reference to external events.

Pulse width or duty cycle measurement is supported in Gated Timer Mode, where the

operation of a timer is controlled by the ‘gate’ level on an external input pin. For these

purposes each timer has one associated port pin (TxIN) which serves as a gate or clock

input. The maximum resolution of the timers in module GPT1 is 4 system clock cycles.

The counting direction (up/down) for each timer can be programmed by software or

altered dynamically by an external signal on a port pin (TxEUD), e.g. to facilitate position

tracking.

In Incremental Interface Mode the GPT1 timers can be directly connected to the

incremental position sensor signals A and B through their respective inputs TxIN and

TxEUD. Direction and counting signals are internally derived from these two input

signals, so that the contents of the respective timer Tx corresponds to the sensor

position. The third position sensor signal TOP0 can be connected to an interrupt input.

Timer T3 has an output toggle latch (T3OTL) which changes its state on each timer

overflow/underflow. The state of this latch may be output on pin T3OUT e.g. for time out

monitoring of external hardware components. It may also be used internally to clock

timers T2 and T4 for measuring long time periods with high resolution.

In addition to the basic operating modes, T2 and T4 may be configured as reload or

capture register for timer T3. A timer used as capture or reload register is stopped. The

contents of timer T3 is captured into T2 or T4 in response to a signal at the associated

input pin (TxIN). Timer T3 is reloaded with the contents of T2 or T4, triggered either by

an external signal or a selectable state transition of its toggle latch T3OTL. When both

T2 and T4 are configured to alternately reload T3 on opposite state transitions of T3OTL

with the low and high times of a PWM signal, this signal can be continuously generated

without software intervention.

Note: Signals T2IN, T2EUD, T4EUD, T6IN and T6EUD are not connected to pins.

XC2230L Datasheet(PDF) 44 Page - Infineon Technologies AG

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