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參數(shù)資料
| 型號(hào)： | HTG2190 |
| 廠商： | Holtek Semiconductor Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-Bit 1024 Pixel LCD Microcontroller |
| 中文描述： | 8位單片機(jī)1024像素LCD |
| 文件頁(yè)數(shù)： | 26/64頁(yè) |
| 文件大小： | 417K |
| 代理商： | HTG2190 |
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HTG2190
Rev. 1.00
26
June 29, 2001
Timer/Event Counter 0/1
Two timer/event counters are implemented in
the HTG2190. The Timer/Event Counter 0 and
1 contain 16-bit programmable count-up coun-
ters whose clock may come from an external
source or the system clock divided by 4. It
should be noted that, if the Timer/Event Coun-
ter 0 is selected, the TMR0 pin should be en-
abled by mask option. The pull-high resistor
can be disabled or enabled by software instruc-
tion.
Using the internal instruction clock, there is
only one reference time-base. The external
clock input allows the user to count external
events, measure time intervals or pulse width,
or to generate an accurate time base.
There are three registers related to
Timer/Event Counter 0; TMR0H (0CH),
TMR0L (0DH), TMR0C (0EH). Writing to
TMR0L only writes the data into a low byte
buffer. Writing to TMR0H will write the data
and the contents of the low byte buffer into the
Timer/EventCounter0preloadregister(16-bit)
simultaneously. The Timer/Event Counter 0
preload register is changed only by a write to
TMR0H operation. Writing to TMR0L will keep
the Timer/Event Counter 0 preload register un-
changed.
Reading TMR0H will also latch the TMR0L
into the low byte buffer to avoid false timing
problems. Reading the TMR0L only returns the
value from the low byte buffer which may be a
previouslyloadedvalue.Inotherwords,thelow
byte of Timer/Event Counter 0 cannot be read
directly. It must read the TMR0H first to en-
sure that the low byte contents of Timer/Event
Counter 0 are latched into the buffer.
There are three registers related to the
Timer/Event Counter 1; TMR1H (0FH),
TMR1L (10H), TMR1C (11H). The Timer/Event
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Timer/Event Counter 0/1
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