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ST10R172LT1

16-BIT LOW VOLTAGE ROMLESS MCU

STMicroelectronics 

ST10R172L - GENERAL PURPOSE TIMERS

9.2 GPT2

The GPT2 module provides precise event control and time measurement. It includes two

timers (T5, T6) and a capture/reload register (CAPREL). Both timers can be clocked with an

input clock derived from the CPU clock via a programmable prescaler or with external signals.

The count direction (up/down) for each timer is programmable by software or altered

dynamically by an external signal on a port pin (TxEUD). Concatenation of the timers is

supported by the output toggle latch (T6OTL) of timer T6, which changes its state on each

timer overflow/underflow.

The state of T6OTL may be used to clock timer T5, or may be output on a port pin T6OUT. The

overflows/underflows of timer T6 reload the CAPREL register. The CAPREL register captures

the contents of T5 based on an external signal transition on the corresponding port pin

(CAPIN), and timer T5 may optionally be cleared after the capture procedure. This allows

absolute time differences to be measured or pulse multiplication to be performedwithout

software overhead.

FCPU=50MHz

Timer input selection

000b

001b

010b

011b

100b

101b

110b

111b

Prescaler

Factor

Input

Frequency

Resolution

Period

4

8

16

32

64

128

256

512

12.5 MHz 6.25 MHz 3.125 1.563 781

391

195

97.6

MHz

MHz

KHz

KHz

KHz

KHz

80ns

160ns 320ns 640ns 1.28 us 2.56 us 5.12 us 10.24 us

5.24ms 10.49ms 20.97ms 41.94ms 83.88ms 167.7ms 335.5ms 671ms

Table 6 GPT2 timer input frequencies, resolution and periods

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