st10f272z2 STMicroelectronics, st10f272z2 Datasheet - Page 63

• Manufacturer Part Number: st10f272z2
• Description: 16-bit Mcu With 256 Kbyte Flash Memory And 20 Kbyte Ram
• Manufacturer: STMicroelectronics

ST10F272Z2
11.2
Table 37.
Table 38.
Pre-scaler factor
Input Freq
Resolution
Period maximum
Pre-scaler factor
Input Freq
Resolution
Period maximum
f
f
CPU
CPU
= 40 MHz
= 64 MHz
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 which is 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 may additionally be altered dynamically by an external signal on a port pin (TxEUD).
Concatenation of the timers is supported via the output toggle latch (T6OTL) of timer T6
which changes its state on each timer overflow/underflow.
The state of this latch may be used to clock timer T5, or it may be output on a port pin
(T6OUT). The overflow / underflow of timer T6 can additionally be used to clock the
CAPCOM timers T0 or T1, and to cause a reload from the CAPREL register. The CAPREL
register may capture the contents of timer 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 performed without software overhead.
The capture trigger (timer T5 to CAPREL) may also be generated upon transitions of GPT1
timer T3 inputs T3IN and/or T3EUD. This is advantageous when T3 operates in Incremental
Interface Mode.
Table 37
scaler option at 40 MHz and 64 MHz CPU clock respectively.
GPT2 timer input frequencies, resolutions and periods at 40 MHz
GPT2 timer input frequencies, resolutions and periods at 64 MHz
6.55 ms
16 MHz
10 MHz
62.5 ns
100 ns
4.1 ms
000b
000b
and
4
4
Table 38
13.1 ms
200 ns
125 ns
8.2 ms
5 MHz
8 MHz
001b
001b
8
8
list the timer input frequencies, resolution and periods for each pre-
2.5 MHz
26.2 ms
16.4 ms
400 ns
250 ns
4 MHz
010b
010b
16
16
Timer Input Selection T5I / T6I
Timer Input Selection T5I / T6I
1.25 MHz
52.4 ms
32.8 ms
2 MHz
0.8 µs
0.5 µs
011b
011b
32
32
104.8 ms 209.7 ms
625 kHz 312.5 kHz 156.25 kHz 78.125 kHz
65.5 ms
1.6 µs
100b
1.0 µs
1 kHz
100b
64
64
131.1 ms
3.2 µs
500 kHz
101b
2.0 µs
128
101b
128
General purpose timer unit
419.4 ms
262.1 ms
250 kHz
6.4 µs
110b
4.0 µs
256
110b
256
838.9 ms
524.3 ms
128 kHz
12.8 µs
8.0 µs
111b
111b
512
512
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