Advantech PCI-1720 Uživatelský manuál Strana 46
- Strana / 54
- Tabulka s obsahem
- KNIHY
Hodnocené. / 5. Na základě hodnocení zákazníků
42 PCI-1713 User's Manual
Counter Latch Operation
Users often want to read the value of a counter without disturbing the
count in progress. You do this by latching the count value for the
specific counter then reading the value.
The 82C54 supports the counter latch operation in two ways. The first
way is to set bits RW1 and RW0 to 0. This latches the count of the
selected counter in a 16-bit hold register. The second way is to
perform a latch operation under the read-back command. Set bits SC1
and SC0 to 1 and CNT = 0. The second method has the advantage of
operating several counters at the same time. A subsequent read
operation on the selected counter will retrieve the latched value.
- PCI-1713 1
- 32-channel Isolated 1
- Analog Input Card 1
- User's manual 1
- Copyright 2
- Acknowledgments 2
- CE notification 2
- On-line Technical Support 2
- Contents 3
- General Information 5
- 1.1 Introduction 6
- 1.2 Features 7
- 1.3 Specifications 7
- Programmable Timer/Counter 8
- General: 9
- 1.4 Block Diagram 10
- Installation 11
- 2.1 Initial Inspection 12
- 2.2 Unpacking 12
- 2.3 Installation Instructions 13
- Signal Connections 15
- 3.1 Overview 16
- 3.2 I/O Connector 16
- 3.3 Analog Input Connections 18
- ExternalInternal 19
- Register Structure 23
- 4.1 Overview 24
- 4.2 I/O Port Address Map 24
- AD11 AD10 AD9 AD8 25
- ONE/FH IRQ GATE EXT PACER SW 26
- Read A/D Data 27
- Bit # 7 6 5 4 3 2 1 0 27
- BASE+1 AD11 AD10 AD9 AD8 27
- BASE+2 S/D B/U G2 G1 G0 28
- Write MUX Control 29
- BASE+5 CH4 CH3 CH2 CH1 CH0 29
- BASE+4 CL4 CL3 CL2 CL1 CL0 29
- 4.7 Control Register BASE+6 31
- Table 4-7: Status register 32
- Read Status Register 32
- BASE+7 IRQ F/F F/H F/E 32
- Registers BASE+24, BASE+26 33
- BASE+28 and BASE+30 33
- Calibration 35
- PCI-1713 REV.A1 01-6 36
- < 0.05 mV 37
- 82C54 Counter Chip 39
- Functions 39
- A.1 Introduction 40
- Registers 40
- Description: 41
- Bit D7 D6 D5 D4 D3 D2 D1 D0 42
- Value 1 1 CNTSTAC2C1C0X 42
- A.3 Counter Operating Modes 43
- A.4 Counter Operations 45
- Counter Latch Operation 46
- PCLD-881B 47
- Wiring Terminal Board 47
- B.1 Introduction 48
- B.2 Features 48
- B.3 Application 48
- B.4 Board Layout 49
- B.5 Single-ended Connections 50
- B.6 Differential Connections 51
- B.7 Technical Diagram 52
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