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参数资料
| 型号： | MSM82C54-2RS |
| 厂商： | OKI SEMICONDUCTOR CO., LTD. |
| 元件分类： | 定时器 |
| 英文描述： | CMOS PROGRAMMABLE INTERVAL TIMER |
| 中文描述： | CMOS可编程间隔计时器 |
| 文件页数： | 23/23页 |
| 文件大小： | 161K |
| 代理商： | MSM82C54-2RS |
9/23
Semiconductor
MSM82C54-2RS/GS/JS
Select Counter (SC0, SC1):
Selection of set counter
0
1
0
SC1
Set Contents
1
0
1
0
SC0
Counter #0 selection
Counter #1 selection
Counter #2 selection
Read Back Command
Read/Load (RL1, RL0):
Count value Reading/Loading format setting
0
1
0
RL1
Set Contents
1
0
1
0
RL0
Counter Latch Operation
Reading/Loading of Least Significant Byte (LSB)
Reading/Loading of Most Significant Byte (MSB)
Reading/Loading of LSB followed by MSB
Mode (M2, M1, M0):
Operation waveform mode setting
BCD:
Operation count mode setting
After setting Read/Load, Mode and BCD in each counter as outlined above, next set the desired
count value. (In some Modes, the count value is set first. In next clock, loading is performed,
then counting starts.) This count value setting must conform with the Read/Load format set
in advance. Note that the internal counters are reset to 0000H during control word setting. The
counter value (0000H) can’t be read.
The program sequence of the MSM82C54-2 is flexible.
Free sequence programming is possible as long as the two following rules are observed:
(i) Write the control word before writing the initial count value in each counter.
(ii) Write the initial count value according to the count value read/write format specified by the
control word.
Note: Unlike the MSM82C53-2, the MSM82C54-2 allows count value setting for another
counter between LSB and MSB settings.
0
0
M2
Set Contents
0
1
0
M1
1
0
1
0
M0
1
0
1
Mode 0 (Interruput on Terminal Count)
Mode 1 (Programmable One-Shot)
Mode 2 (Rate Generator)
Mode 3 (Square Wave Generator)
Mode 4 (Software Triggered Strobe)
Mode 5 (Hardware Triggered Strobe)
: denotes "not specified"
1
0
BCD
Set Contents
Binary Count (16-bit Binary)
BCD Count (4-decade Binary Coded Decimal)
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