ST10R272L STMicroelectronics, ST10R272L Datasheet - Page 29

• Manufacturer Part Number: ST10R272L
• Description: 16-BIT Romless MCU WITH MAC UNIT
• Manufacturer: STMicroelectronics

Specifications of ST10R272L

• Cpu Frequency: 0 to 50 MHz
• Power: 3.3 Volt +/-0.3V

10.2 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.
F
Prescaler
Factor
Input
Frequency
Resolution
Period
CPU
=50MHz
Table 9 GPT2 timer input frequencies, resolution and periods
Timer input selection
000b
4
12.5 MHz 6.25 MHz 3.125
80ns
5.24ms
001b
8
160ns
10.49ms
010b
16
MHz
320ns
20.97ms 41.94ms
011b
32
1.563
MHz
640ns
ST10R272L - GENERAL PURPOSE TIMERS
100b
64
781
KHz
1.28 us
83.88ms
101b
128
391
KHz
167.7ms
2.56 us
110b
256
195
KHz
5.12 us
335.5ms 671ms
111b
512
97.6
KHz
10.24 us
29/77
1