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參數(shù)資料
| 型號： | DM6806 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | DM5806 DATA MODULE DIGITAL I/O BOARD |
| 中文描述： | DM5806數(shù)據(jù)模塊數(shù)字I / O板 |
| 文件頁數(shù)： | 30/64頁 |
| 文件大?。?/td> | 270K |
| 代理商： | DM6806 |
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3-4
Timer/Counters
An 8254 programmable interval timer provides three 16-bit, 8 MHz timer/counters to support a wide range of
timing and counting functions. These timer/counters can be cascaded or used individually for many applications.
Each timer/counter has two inputs, CLK in and GATE in, and one output, timer/counter OUT. The clock
sources for the timer/counters can be selected using jumpers on header connector P5 (see Chapter 1). The timer/
counters can be programmed as binary or BCD down counters by writing the appropriate data to the command word,
as described in Chapter 4. The command word also lets you set up the mode of operation. The six programmable
modes are:
Mode 0
Mode 1
Mode 2
Mode 3
Mode 4
Mode 5
Event Counter (Interrupt on Terminal Count)
Hardware-Retriggerable One-Shot
Rate Generator
Square Wave Mode
Software-Triggered Strobe
Hardware Triggered Strobe (Retriggerable)
These modes are detailed in the 8254 Data Sheet, reprinted from Intel in Appendix C.
Interrupts
The DM5806 can use any one of six signal sources to generate interrupts. These sources are: OT0, OT1, and
OT2, which are the three 8254 timer/counter outputs; PC3, which is the INTRA signal from the 8255 PPI; PC0,
which is the INTRB signal from the 8255 PPI; and EXT, an external interrupt you can route onto the board through
the P2 I/O connector. Chapter 1 tells you how to set the jumpers on interrupt header connectors P3 and P4, and
Chapter 4 provides some programming information.
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