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ST10F280 Datasheet(PDF) 79 Page - STMicroelectronics

Part # ST10F280
Description  16-bit MCU with MAC unit, 512 Kbyte Flash memory and 18 Kbyte RAM
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST10F280 Datasheet(HTML) 79 Page - STMicroelectronics

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ST10F280
General purpose timer unit
Doc ID 8673 Rev. 3
79/239
Figure 15.
Block diagram of GPT1
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 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.
Table 12.
GPT1 timer input frequencies, resolution and periods
fCPU = 40MHz
Timer input selection T2I / T3I / T4I
000b
001b
010b
011b
100b
101b
110b
111b
Pre-scaler factor
8
16
32
64
128
256
512
1024
Input Freq
5MHz
2.5MHz
1.25MHz
625kHz
312.5kHz
156.25kHz
78.125kHz
39.1kHz
Resolution
200ns
400ns
0.8µs
1.6µs
3.2µs
6.4µs
12.8µs
25.6µs
Period maximum
13.1ms
26.2ms
52.4ms
104.8ms
209.7ms
419.4ms
838.9ms
1.678s


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