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| 型號： | HT48R11-2(24SKDIP-B0) |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-BIT MICROCONTROLLER |
| 中文描述： | 8位微控制器 |
| 文件頁數(shù)： | 16/42頁 |
| 文件大?。?/td> | 259K |
| 代理商： | HT48R11-2(24SKDIP-B0) |
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HT48R50A-1/HT48C50-1
Rev. 1.00
16
January 2, 2003
There are 3 registers related to Timer/Event Counter 1;
TMR1H (0FH), TMR1L (10H), TMR1C (11H). Writing
TMR1L will only put the written data to an internal
lower-order byte buffer (8 bits) and writing TMR1H will
transfer the specified data and the contents of the
lower-order byte buffer to TMR1H and TMR1L preload
registers, respectively. The Timer/Event Counter 1
preload register is changed by each writing TMR1H op-
erations. Reading TMR1H will latch the contents of
TMR1H and TMR1L counters to the destination and the
lower-order byte buffer, respectively. Reading the
TMR1L will read the contents of the lower-order byte
buffer. The TMR1C is the Timer/Event Counter 1 control
register,whichdefinestheoperatingmode,countingen-
able or disable and active edge.
The TM0, TM1 bits define the operating mode. The
event count mode is used to count external events,
which means the clock source comes from an external
(TMR0/TMR1) pin. The timer mode functions as a nor-
mal timer with the clock source coming from the f
INT
clock/instruction clock or RTC clock (Timer0/Timer1). The
pulse width measurement mode can be used to count the
high or low level duration of the external signal
(TMR0/TMR1). The counting is based on the f
INT
clock/in-
struction clock or RTC clock (Timer0/Timer1).
In the event count or timer mode, once the Timer/Event
Counter 0/1 starts counting, it will count from the current
contentsintheTimer/EventCounter0/1toFFHorFFFFH.
Once overflow occurs, the counter is reloaded from the
Timer/Event Counter 0/1 preload register and generates
the interrupt request flag (T0F/T1F; bit 5/6 of INTC) at the
same time.
In the pulse width measurement mode with the TON
and TE bits equal to one, once the TMR0/TMR1 has re-
ceived a transient from low to high (or high to low if the
TE bits is 0 ) it will start counting until the TMR0/TMR1
returns to the original level and resets the TON. The
measured result will remain in the Timer/Event Counter
0/1 even if the activated transient occurs again. In other
words, only one cycle measurement can be done. Until
setting the TON, the cycle measurement will function
again as long as it receives further transient pulse. Note
that, in this operating mode, the Timer/Event Counter
0/1 starts counting not according to the logic level but
according to the transient edges. In the case of counter
overflows, the counter 0/1 is reloaded from the
Timer/Event Counter 0/1 preload register and issues the
interrupt request just like the other two modes. To en-
able the counting operation, the timer ON bit (TON; bit 4
ofTMR0C/TMR1C)shouldbesetto1.Inthepulsewidth
measurement mode, the TON will be cleared automati-
cally after the measurement cycle is completed. But in
the other two modes the TON can only be reset by in-
structions. The overflow of the Timer/Event Counter 0/1
is one of the wake-up sources. No matter what the oper-
ation mode is, writing a 0 to ET0I/ET1I can disable the
corresponding interrupt services.
In the case of Timer/Event Counter 0/1 OFF condition,
writing data to the Timer/Event Counter 0/1 register
will also reload that data to the Timer/Event Counter 0/1.
But if the Timer/Event Counter 0/1 is turned on, data
written to it will only be kept in the Timer/Event Counter
0/1 preloadregister.TheTimer/EventCounter0/1willstill
operate until overflow occurs (a Timer/Event Counter 0/1
reloading will occur at the same time). When the
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