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| 型號(hào)： | HMS99C58S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH |
| 中文描述： | 8位單片機(jī)與嵌入式閃存微控制器 |
| 文件頁(yè)數(shù)： | 25/73頁(yè) |
| 文件大?。?/td> | 696K |
| 代理商： | HMS99C58S |
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HMS99C51S/52S/54S/56S/58S
Sep. 2004 Ver 1.01
21
TIMER / COUNTER 0 AND 1
Timer/Counter 0 and 1 can be used in four operating modes as listed in Table 4:
In the “timer” function (C/T = “0”) the register is incremented every machine cycle. Therefore the count rate is
f
OSC
/12.
In the “counter” function the register is incremented in response to a 1-to-0 transition at its corresponding ex-
ternal input pin (P3.4/T0, P3.5/T1). Since it takes two machine cycles to detect a falling edge the max. count
rate is f
OSC
/24. External inputs INT0 and INT1 (P3.2, P3.3) can be programmed to function as a gate to facilitate
pulse width measurements. Figure 4 illustrates the input clock logic.
Figure 4. Timer/Counter 0 and 1 Input Clock Logic
Mode
Description
TMOD
Input Clock
Gate
C/T
M1
M0
internal
external (Max.)
0
8-bit timer/counter with a
divide-by-32 prescaler
X
X
0
0
f
OSC
÷
(12
×
32)
f
OSC
÷
(24
×
32)
1
16-bit timer/counter
X
X
0
1
f
OSC
÷
12
f
OSC
÷
24
2
8-bit timer/counter with
8-bit auto-reload
X
X
1
0
f
OSC
÷
12
f
OSC
÷
24
3
Timer/counter 0 used as
one 8-bit timer/counter and
one 8-bit timer Timer 1
stops
X
X
1
1
f
OSC
÷
12
f
OSC
÷
24
Table 4. Timer/Counter 0 and 1 Operating Modes
f
OSC
÷
12
TMOD
f
OSC
÷
12
P3.4/T0
P3.5/T1
Max.
f
OSC
/24
C/T
=1
≥
1
TCON
TR0 / 1
TMOD
Gate
&
P3.2 / INT0
P3.3 / INT1
Timer 0/1
Input Clock
0
1
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