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參數(shù)資料
| 型號： | GMS87C2020LQ |
| 廠商： | HYNIX SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MEMORY CARD COMPACTFLASH 128MB |
| 中文描述： | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | LQFP-64 |
| 文件頁數(shù)： | 49/107頁 |
| 文件大?。?/td> | 1482K |
| 代理商： | GMS87C2020LQ |
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HMS81C2012A/2020A
SEP. 2004 Ver 2.00
45
12. TIMER/EVENT COUNTER
The HMS81C20xxA has two Timer/Counter registers.
Each module can generate an interrupt to indicate that an
event has occurred (i.e. timer match).
Timer 0 and Timer 1 are can be used either two 8-bit Tim-
er/Counter or one 16-bit Timer/Counter with combine
them.
In the "timer" function, the register is increased every in-
ternal clock input. Thus, one can think of it as counting in-
ternal clock input. Since a least clock consists of 2 and
most clock consists of 2048 oscillator periods, the count
rate is 1/2 to 1/2048 of the oscillator frequency in Timer0.
And Timer1 can use the same clock source too. In addition,
Timer1 has more fast clock source (1/1 to 1/8).
In the “counter” function, the register is increased in re-
sponse to a 1-to-0 (falling edge) or 0-to-1(rising edge) tran-
sition at its corresponding external input pin, EC0.
In addition the “capture” function, the register is increased
in response external or internal clock sources same with
timer or counter function. When external clock edge input,
the count register is captured into capture data register
CDRx.
Timer1 is shared with "PWM" function and "Compare out-
put" function
It has seven operating modes: "8-bit timer/counter", "16-
bit timer/counter", "8-bit capture", "16-bit capture", "8-bit
compare output", "16-bit compare output" and "10-bit
PWM" which are selected by bit in Timer mode register
TM0 and TM1 as shown in Figure 12-1 and Table 12-1.
16BIT
CAP0
CAP1
PWM1E
T0CK
[2:0]
T1CK
[1:0]
PWM1O
TIMER 0
TIMER 1
0
0
0
0
XXX
XX
0
8-bit Timer
8-bit Timer
0
0
1
0
111
XX
0
8-bit Event counter
8-bit Capture
0
1
0
0
XXX
XX
1
8-bit Capture (internal clock)
8-bit Compare Output
0
X
0
1
XXX
XX
1
8-bit Timer/Counter
10-bit PWM
1
0
0
0
XXX
11
0
16-bit Timer
1
0
0
0
111
11
0
16-bit Event counter
1
1
X
0
XXX
11
0
16-bit Capture (internal clock)
1
0
0
0
XXX
11
1
16-bit Compare Output
Table 12-1 Operating Modes of Timer0 and Timer1
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