Adlink PCI-8554 Manual do Utilizador descarregar pdf (Página 47)

Signal Connection and Applications

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4.7 Event Counter

This example counts how many external events in 1 second

Step 1: This application requires one counter to generate a

time base of 1 second and the second counter to

count the event. Cascaded counters 11and 12 are

used as a watchdog timer. Counter 1 is used in this

example to count the external events. The clock

source of counter 1 is the event signal so the

frequency is not fixed.

Step 2: Connect ECLK1 to the signal to be measured and

adjust JP1 to enable the debounce function.

Step 4: The gate source of counter 1 is always enabled, so

the external gate is open.

Step 5: Write the control program. Refer to‘DEMO5.C’

source code.

COUT1

Counter #1

8254 Chip #1

'H'

COUT12

Counter #12

8254 Chip #4

ECK1

GND

CK1

COUT10

debounce

system

DB_CLK

JP1

2MHz

COUT11

selectable by function

"_8554_SET_DBCLK"

ECLK1

( Event Signal )

selectable by

function

Counter #11

8254 Chip #4

'H'

8MHz

Figure 24: Example of event counter

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 66 67

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