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| 型號(hào)： | HMS87C1304AD |
| 廠商： | HYNIX SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | CMOS SINGLE-CHIP 8-BIT MICROCONTROLLER |
| 中文描述： | 8-BIT, OTPROM, 8 MHz, MICROCONTROLLER, PDSO24 |
| 封裝： | SOP-24 |
| 文件頁數(shù)： | 36/70頁 |
| 文件大?。?/td> | 977K |
| 代理商： | HMS87C1304AD |
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HMS87C1304A/HMS87C1302A
HYUNDAI MicroElectronics
36
Preliminary
Jan. 2001
12. TIMER / COUNTER
The HMS87C1304A and HMS87C1302A 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 can be used either the two 8-bit Tim-
er/Counter or one 16-bit Timer/Counter by combining
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 0-to-1 (rising edge) transition at its correspond-
ing external input pin, EC0(Timer 0).
In addition the “capture” function, the register is increased
in response external interrupt same with timer function.
When external interrupt edge input, the count register is
captured into capture data register CDRx.
Timer1 is shared with “PWM” function and “Compare
output” 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
TMx as shown in Figure 12-1 and Table 12-1 .
Figure 12-1 Timer Mode Register (TM0, TM1)
Timer 0 Mode Register
TM0
ADDRESS : D0H
RESET VALUE : --000000
-
-
CAP0
T0CK2
T0CK1
T0CK0
T0CN
T0ST
Timer 1 Mode Register
TM1
ADDRESS : D2H
RESET VALUE : 00000000
POL
16BIT
PWM0E
CAP1
T1CK1
T1CK0
T1CN
T1ST
CAP0
Capture mode selection bit.
0 : Disables Capture
1 : Enables Capture
T0CN
Continue control bit
0 : Stop counting
1 : Start counting continuously
T0CK[2:0]
Input clock selection
000 : fxin
÷
2, 100 : fxin
÷
128
001 : fxin
÷
4, 101 : fxin
÷
512
010 : fxin
÷
8, 110 : fxin
÷
2048
011 : fxin
÷
32, 111 : External Event ( EC0 )
T0ST
Start control bit
0 : Stop counting
1 : Counter start ( It must be stop before restart )
POL
PWM Output Polarity
0 : Duty active low
1 : Duty active high
T1CK[2:0]
Input clock selection
00 : fxin 10 : fxin
÷
8
01 : fxin
÷
2 11 : using the Timer 0 clock
16BIT
16-bit mode selection
0 : 8-bit mode
1 : 16-bit mode
T1CN
Continue control bit
0 : Stop counting
1 : Start counting continuously
PWM0E
PWM enable bit
0 : Disables PWM
1 : Enables PWM
T1ST
Start control bit
0 : Stop counting
1 : Counter start ( It must be stop before restart )
CAP1
Capture mode selection bit.
0 : Disables Capture
1 : Enables Capture
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