參數(shù)資料
型號： HMS81C2020AQ
廠商： Electronic Theatre Controls, Inc.
英文描述： CMOS Single-Chip 8-Bit Microcontroller with A/D Converter & VFD Driver
中文描述： CMOS單芯片8位微控制器與A / D轉(zhuǎn)換器
文件頁數(shù)： 56/107頁
文件大小： 1482K
代理商： HMS81C2020AQ
HMS81C2012A/2020A
52
SEP. 2004 Ver 2.00
12.3 8-bit Compare Output (16-bit)
The HMS81C20xxA has a function of Timer Compare
Output. To pulse out, the timer match can goes to port
pin(T0O, T1O) as shown in Figure 12-2 and Figure 12-7.
Thus, pulse out is generated by the timer match. These op-
eration is implemented to pin, T0O, PWM1O/T1O.
In this mode, the bit PWM1O/T1O of R5 function register
(R5FUNC.6) should be set to "1", and the bit PWM1E of
timer1 mode register (TM1) should be set to "0". In addi-
tion, 16-bit Compare output mode is available, also.
This pin output the signal having a 50 : 50 duty square
wave, and output frequency is same as below equation.
12.4 8-bit Capture Mode
The Timer 0 capture mode is set by bit CAP0 of timer
mode register TM0 (bit CAP1 of timer mode register TM1
for Timer 1) as shown in Figure 12-8.
As mentioned above, not only Timer 0 but Timer 1 can also
be used as a capture mode.
The Timer/Counter register is increased in response inter-
nal or external input. This counting function is same with
normal timer mode, and Timer interrupt is generated when
timer register T0 (T1) increases and matches TDR0
(TDR1).
This timer interrupt in capture mode is very useful when
the pulse width of captured signal is more wider than the
maximum period of Timer.
For example, in Figure 12-10, the pulse width of captured
signal is wider than the timer data value (FF
H
) over 2
times. When external interrupt is occurred, the captured
value (13
H
) is more little than wanted value. It can be ob-
tained correct value by counting the number of timer over-
flow occurrence.
Timer/Counter still does the above, but with the added fea-
ture that a edge transition at external input INTx pin causes
the current value in the Timer x register (T0,T1), to be cap-
tured into registers CDRx (CDR0, CDR1), respectively.
After captured, Timer x register is cleared and restarts by
hardware.
Note:
The CDRx, TDRx and Tx are in same address. In
the capture mode, reading operation is read the CDRx, not
Tx because path is opened to the CDRx, and TDRx is only
for writing operation.
It has three transition modes: "falling edge", "rising edge",
"both edge" which are selected by interrupt edge selection
register IEDS (Refer to External interrupt section). In ad-
dition, the transition at INTx pin generate an interrupt.
f
COMP
TDR
1
)
+
(
×
×
2
=
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