參數(shù)資料
型號(hào)： DMC73C168
英文描述： 8Bit Single Chip Microcontroller
中文描述： 8位單芯片微控制器
文件頁(yè)數(shù)： 40/90頁(yè)
文件大?。?/td> 742K
代理商： DMC73C168
40
8Bit Single Chip Microcontroller
DMC73C167
5.5.1.3 Event Counter Mode (EC)
When Timer 1 is in event counter mode, port A1 is the clock source for Timer 1.
The maximum clock frequency on A1 at the event counter mode must not be greater than
Fosc/4. The minimum pulse width must not be less than 2/Fosc. Each positive pulse
Transition decrements the counter chain.
5.5.1.4 Timer 1 Interrupt Period
The period of the timer INT2_0 interrupt can be calculated as follows.
tINT = tCLK x (PL + 1) x (TL +1)
where :
tINT = period of timer interrupt
tCLK = 4/Fosc. for the internal real-time clock mode or the period of the input
clock source at the external EC mode
PL = Prescaler latch value (00h-1Fh : 5-bit)
TL = Decrementer reload value (0000h-FFFFh : 16-bit)
Example min : 1us
(Fosc : 4MHz) max : 2.097 sec
5.5.1.5 Capture Latch
The current value of the decrementer is stored in the capture latch register at the active
edge of Port A3. The active edge is determined by the INT-1 EDGE bit of the IOCTL2 (P2.1)
register. The capture latch is desabled during the IDLE instruction.
5.5.1.6 Timer Output Function
A timer output function exists on Timer 1 that allows the B0 output to be toggled every timer
decrements through zero. This function is enabled by the T1OUT bit of the timer control
register (T1CTL0.6). When operating in the timer output mode, the B0 output cannot be
changed by writing to the B port data register. Writing to the timer's START bit will reload
and start the timer but will not toggle the output. The output will toggle only when the timer
decrements through zero. The timer output feature is independent INT2_0 and therefore
will operate whether or not INT2_0 is enabled.
Whenever the T1OUT bit is returned to 0, B0 will become the normal output port. The value in
the B0 data register will be the last value output by the timer output function, and the CPU
can control the B0 data.
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