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參數(shù)資料
| 型號： | ST72621J2B1 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP20 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-20 |
| 文件頁數(shù)： | 79/136頁 |
| 文件大?。?/td> | 2475K |
| 代理商： | ST72621J2B1 |
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ST7262
47/136
PWM AUTO-RELOAD TIMER (Cont’d)
Input capture function
This mode allows the measurement of external
signal pulse widths through ICRx registers.
Each input capture can generate an interrupt inde-
pendently on a selected input signal transition.
This event is flagged by a set of the corresponding
CFx bits of the Input Capture Control/Status regis-
ter (ICCSR).
These
input
capture
interrupts
are
enabled
through the CIEx bits of the ICCSR register.
The active transition (falling or rising edge) is soft-
ware programmable through the CSx bits of the
ICCSR register.
The read only input capture registers (ICRx) are
used to latch the auto-reload counter value when a
transition is detected on the ARTICx pin (CFx bit
set in ICCSR register). After fetching the interrupt
vector, the CFx flags can be read to identify the in-
terrupt source.
Note: After a capture detection, data transfer in
the ICRx register is inhibited until the ARTICCSR
register is read (clearing the CFx bit).
The timer interrupt remains pending while the CFx
flag is set when the interrupt is enabled (CIEx bit
set). This means, the ARTICCSR register has to
be read at each capture event to clear the CFx
flag.
The timing resolution is given by auto-reload coun-
ter cycle time (1/fCOUNTER).
During HALT mode, input capture is inhibited (the
ICRx is never re-loaded) and only the external in-
terrupt capability can be used.
External interrupt capability
This mode allows the Input capture capabilities to
be used as external interrupt sources.
The edge sensitivity of the external interrupts is
programmable (CSx bit of ICCSR register) and
they are independently enabled through CIEx bits
of the ICCSR register. After fetching the interrupt
vector, the CFx flags can be read to identify the in-
terrupt source.
The interrupts are synchronized on the counter
clock rising edge (Figure 36).
During HALT mode, the external interrupts can still
be used to wake up the micro (if CIEx bit is set).
Figure 36. ART External Interrupt
Figure 37. Input Capture Timing Diagram
ARTICx PIN
CFx FLAG
t
fCOUNTER
INTERRUPT
COUNTER
t
01h
fCOUNTER
xxh
02h
03h
04h
05h
06h
07h
04h
ARTICx PIN
CFx FLAG
ICRx REGISTER
INTERRUPT
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