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參數(shù)資料
| 型號(hào)： | 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)： | 40/64頁 |
| 文件大?。?/td> | 270K |
| 代理商： | DM6806 |
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4-10
CLK1
CLK2
CLK0
ON-BOARD
I/O CONNECTOR
P6
PIN 17
PIN 13
PIN 15
8254
TIMER/
COUNTER
0
CLK
GATE
OUT
TIMER/
COUNTER
1
CLK
GATE
OUT
TIMER/
COUNTER
2
CLK
GATE
OUT
PIN 10
PIN 18
OSC(8 MHz)
P5
+5 V
+5 V
+5 V
PIN 11
PIN 12
PIN 14
PIN 16
T/C OUT 0
OT0
OT1
EXT CLK 0
T/C OUT 1
EXT CLK 1
EXT GATE 2
T/C OUT 2
EXT CLK 2
EXT GATE 0
EXT GATE 1
Fig. 4-1 — 8254 Timer/Counter Circuit Block Diagram
Mode 0, Event Counter (Interrupt on Terminal Count).
This mode is typically used for event counting.
While the timer/counter counts down, the output is low, and when the count is complete, it goes high. The output
stays high until a new Mode 0 control word is written to the timer/counter.
Mode 1, Hardware-Retriggerable One-Shot.
The output is initially high and goes low on the clock pulse
following a trigger to begin the one-shot pulse. The output remains low until the count reaches 0, and then goes high
and remains high until the clock pulse after the next trigger.
Mode 2, Rate Generator.
This mode functions like a divide-by-N counter and is typically used to generate a
real-time clock interrupt. The output is initially high, and when the count decrements to 1, the output goes low for
one clock pulse. The output then goes high again, the timer/counter reloads the initial count, and the process is
repeated. This sequence continues indefinitely.
Mode 3, Square Wave Mode.
Similar to Mode 2 except for the duty cycle output, this mode is typically used
for baud rate generation. The output is initially high, and when the count decrements to one-half its initial count, the
output goes low for the remainder of the count. The timer/counter reloads and the output goes high again. This
process repeats indefinitely.
Mode 4, Software-Triggered Strobe.
The output is initially high. When the initial count expires, the output
goes low for one clock pulse and then goes high again. Counting is “triggered” by writing the initial count.
Mode 5, Hardware Triggered Strobe (Retriggerable).
The output is initially high. Counting is triggered by
the rising edge of the gate input. When the initial count has expired, the output goes low for one clock pulse and
then goes high again.
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