becomes:

BASE + 30(Dec) 82C54 control, read-back mode

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Value

1

1

CNT

STA

C2

C1

C0

X

CNT = 0 Latch count of selected counter(s).

STA = 0

Latch status of selected counter(s).

C2, C1 & C0 Select counter for a read-back operation.

C2 = 1 select Counter 2

C1 = 1 select Counter 1

C0 = 1 select Counter 0

If you set both SC1 and SC0 to 1 and STA to 0, the register selected by C2 to C0 contains a byte which shows the status of the counter. The data format of the counter read/write register then becomes:

BASE+24/26/28(Dec) Status read-back mode

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Value

OUT

NC

RW1

RW0

M2

M1

M0

BCD

 

 

 

 

 

 

 

 

 

OUT Current state of counter output

NC Null count is 1 when the last count written to the counter register has been loaded into the counting element

Appendix A 8524 Counter Chip Functions 55

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Image 59
Advantech PCI-1710 user manual Sta =

PCI-1710 specifications

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