Timer/Counter Signal Pads; Clock Source Pads - Advantech PCL-720 User Manual

PCL-720
Connector 5:

3.2. Timer/Counter Signal Pads

To make the wiring of the 8253 counter input and output signals easier for
user's application, all the "CLK", "GATE" and "OUT" signals of the three 16
bit counters have their soldering pads. These pads have exactly the same
signals as those on connector CN5. For example, if a user wants to use the
output of counter 0 (OUT0) as the clock source of counter 1 (CLK1), he (she)
can place a wire between the pads marked "OUT0" and "CLK1".

3.3. Clock Source Pads

There are 3 pads offer clock sources of 1MHz, 100KHz and 10KHz when the JP1
is inserted with a jumper at the position 'xl'. These frequencies can be double,
half or quartered by placing the jumper on the position 'x2', 'x1/2' or 'x1/4' of the
JP1. The user can link one of the clock source to the clock input of the 8253
timer/counter by placing a wire between the corresponding pads. For example,
if a user want that the counter 2 has 1 MHz clock input, he(she) can just solder
a wire between pads "1M" and "CLK2" and place a jumper on
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JP2
o CLK0
o GATE0
o OUT0
o CLK1
o GATE1
o OUT1
o CLK2
o GATE2
o OUT2
Signal Connection