Advantech PCI-1751U Manuel d'utilisateur télécharger pdf (Page 31)

27 Appendix A

The data format for the control register appears below:

BASE+27 8254 control, standard mode

Bit D7D6D5D4D3D2D1D0

Value SC1 SC0 RW1 RW0 M2 M1 M0 BCD

Description:

SC1 & SC0Select counter

Counter SC1 SC0

000

101

210

Read-back command 1 1

RW1 & RW0Select read/write operation

Operation RW1 RW0

Counter latch 0 0

Read/write LSB 0 1

Read/write MSB 1 0

Read/write LSB first, 1 1

then MSB

M2, M1 & M0Select operating mode

M2 M1 M0 Mode

0 0 0 0 programmable one shot

0 0 1 1 programmable one shot

X 1 0 2 Rate generator

X 1 1 3 Square wave rate generator

1 0 0 4 Software triggered strobe

1 0 1 5 Hardware triggered strobe

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 37 38

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