Advantech PCI-1718 Manuel d'utilisateur télécharger pdf (Page 82)

PCI-1718 Series User Manual 74

C.14 Timer/Counter Enable — BASE+0AH

Write register BASE+0AH enables or disables the PCI-1718 card’s timer/

counter.

TC0 Disable/enable pacer

0 Pacer enabled

1 Pacer controlled by TRIG0. This blocks trigger pulses sent from the

pacer to the A/D until TRIG0 is taken high.

TC1 Counter 0 input source mode

0 Sets Counter 0 to accept external clock pulses

1 Connects Counter 0 internally to a 100 KHz clock source

C.15 Programmable Timer/Counter — BASE+0C~0FH

The four registers located at addresses BASE+0CH, BASE+0DH,

BASE+0EH and BASE+0FH are used for the Intel 8254 programmable

timer/counter. Please refer to the 8254 product literature for detailed

application information.

Table C.16: Register for Timer/Counter Enable

Write Timer/Counter enable

Bit # 7 654321 0

BASE + 0AH TC1 TC0

1 2 ... 77 78 79 80 81 82 83 84 85 86 87 ... 93 94

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Advantech PCI-1718 Manuel d'utilisateur Page 82