参数资料
型号: ST10R272LT6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, 50 MHz, MICROCONTROLLER, PQFP100
封装: 14 X 14 MM, TQFP-100
文件页数: 22/77页
文件大小: 707K
代理商: ST10R272LT6
29/77
ST10R272L - GENERAL PURPOSE TIMERS
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
CPU=50MHz
Timer input selection
000b
001b
010b
011b
100b
101b
110b
111b
Prescaler
Factor
4
8
16
32
64
128
256
512
Input
Frequency
12.5 MHz 6.25 MHz 3.125
MHz
1.563
MHz
781
KHz
391
KHz
195
KHz
97.6
KHz
Resolution
80ns
160ns
320ns
640ns
1.28 us
2.56 us
5.12 us
10.24 us
Period
5.24ms
10.49ms
20.97ms
41.94ms
83.88ms
167.7ms
335.5ms
671ms
Table 9 GPT2 timer input frequencies, resolution and periods
1
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