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参数资料
| 型号： | MSM82C54-2 |
| 厂商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Programmable Universal Timers(可编程中断定时器,最高计数频率10MHz) |
| 中文描述： | 可编程通用定时器（可编程中断定时器，最高计数频率10MHz时） |
| 文件页数： | 18/23页 |
| 文件大小： | 162K |
| 代理商： | MSM82C54-2 |
18/23
Semiconductor
MSM82C54-2RS/GS/JS
(3) Read Back Command Operation
Use of the read back command enables the user to check the count value, program mode,
output pin state and null count flag of the selected counter.
The command is written in the control word register, and the format is as shown below. For
this command, the counter selection occurs according to bits D
3
, D
2
and D
1
.
It is possible to latch multiple counters by using the read back command. Latching of a read
counter is automatically canceled but other counters are kept latched. If multiple read back
commands are written for the same counter, commands other than the first one are ignored.
It is also possible to latch the status information of each counter by using the read back
command. The status of a certain counter is read when the counter is read. The counter
status format is as follows:
Bits D
5
to D
0
indicate the mode programmed by the most recently written control word.
Bit D
7
indicates the status of the output pin.
Use of this bit makes it possible to monitor the counter output, so the corresponding
hardware may be omitted.
OUTPUT
D
7
NULL
COUNT
D
6
RL1
D
5
RL0
D
4
M2
D
3
M1
D
2
M0
D
1
BCD
D
0
D
7
: 1 = Output pin status is 1.
0 = Output pin status is 0.
D
6
: 1 = Null count
0 = Count value reading is effective
D
5
- D
0
: Programmed mode of counter
(See the control word format.)
1
D
7
1
D
6
COUNT
D
5
STATUS
D
4
CNT2
D
3
CNT1
D
2
CNT0
D
1
0
D
0
(CS=0, A
0
, A
1
=1, RD=1, WR=0)
D
5
: 0 = Selected counter latch operation
D
4
: 0 = Selected counter status latch operation
D
3
: 1 = Counter #2 selection
D
2
: 1 = Counter #1 selection
D
1
: 1 = Counter #0 selection
D
0
: 0
=
Fixed
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MSM82C54-2GS | 制造商:OKI 制造商全称:OKI electronic componets 功能描述:CMOS PROGRAMMABLE INTERVAL TIMER |
| MSM82C54-2J3 | 制造商:OKI Semiconductor 功能描述:CPU I/OS EOL311208 制造商:ROHM Semiconductor 功能描述: |
| MSM82C54-2JS | 制造商:ROHM Semiconductor 功能描述: |
| MSM82C54-2JSDR1 | 制造商:ROHM Semiconductor 功能描述: |
| MSM82C54-2R3 | 制造商:OKI Semiconductor 功能描述:PROG'ABLE PERIPHERAL INTERFACE EOL211209 |
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