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參數(shù)資料
| 型號： | HT47C20L |
| 廠商： | Holtek Semiconductor Inc. |
| 元件分類： | 數(shù)學處理器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 21/55頁 |
| 文件大?。?/td> | 341K |
| 代理商： | HT47C20L |
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HT47C20L
21
January 18, 2000
Timer/event counter
One 16-bit timer/event counter with PFD out-
put or two channels of RC type A/D converter is
implemented in the HT47C20L. The ADC/TM
bit (bit 1 of ADCR register) decides whether
timer A and timer B are composed of one 16-bit
timer/event counter or timer A and timer B are
composed of two channels RC type A/D con-
verter.
The TMRAL, TMRAH, TMRBL, TMRBH com-
posed of one 16-bit timer/event counter, when
ADC/TM bit is 0 . The TMRBL and TMRBH
are timer/event counter preload registers for
lower-order byte and higher-order byte respec-
tively.
The timer/event counter clock source may come
from system clock or T1 (system clock/4) or real
time clock time-out signal or external source.
The external clock input allows the user to count
externalevents,countexternalRCtypeA/Dclock,
measure time intervals or pulse widths, or gener-
ate an accurate time base.
There are six registers related to the timer/event
counteroperatingmode.TMRAH([20H]),TMRAL
([21H]),TMRC([22H]),TMRBH([23H]),TMRBL
([24H]) and ADCR ([25H]). Writing to TMRBL
only writes the data into a low byte buffer, and
writing to TMRBH will write the data and the
contentsofthelowbytebufferintothetime/event
counter preload register (16-bit) simultaneously.
The timer/event counter preload register is
changed by writing to TMRBH operations and
writing to TMRBL will keep the timer/event
counterpreloadregisterunchanged.
Reading TMRAH will also latch the TMRAL
into the low byte buffer to avoid the false timing
problem. Reading TMRAL returns the contents
of the low byte buffer. In other words, the low
byte of the timer/event counter can not be read
directly. It must read the TMRAH first to make
the low byte contents of timer/event counter be
latched into the buffer.
The TMRC is the timer/event counter control
register, which defines the timer/event counter
options.
The timer/event counter control register define
the operating mode, counting enable or disable
and active edge.
Writing to timer B location puts the starting
value in the timer/event counter preload regis-
ter, while reading timer Ayields the contents of
the timer/event counter. Timer B is timer/event
counter preload register.
The TN0, TN1 and TN2 bits define the opera-
tion mode. The event count mode is used to
count external events, which means that the
clock source comes from an external (TMR) pin.
The A/D clock mode is used to count external
A/D clock, the RC oscillation mode is decided by
ADCR register. The timer mode functions as a
normal timer with the clock source coming from
the internal selected clock source. Finally, the
pulse width measurement mode can be used to
count the high or low level duration of the ex-
ternal signal (TMR). The counting is based on
the T1 (system clock/4).
In the event count, A/D clock or internal timer
mode, once the timer/event counter starts
counting, it will count from the current con-
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Timer/event counter
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PDF描述 |
|---|---|
| HT47C20 | 8-BIT MICROCONTROLLER |
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相關(guān)代理商/技術(shù)參數(shù) |
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| HT47C20L_05 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:R-F Type Low Voltage 8-Bit Mask MCU |
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| HT47R20A-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:R-F Type 8-Bit MCU |
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