Beckhoff C1230S Manual do Utilizador descarregar pdf (Página 9)

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ISA Bus interface card C1230S 9

C1230S

Special

keys

S10 S9 S8 S7 S6 S5 S4 S3 S2 S1

Port

Port C Port A

Address

222H 220H

Bit

1 0 7 6 5 4 3 2 1 0

Pressed=

0 0 0 0 0 0 0 0 0 0

Cleared=

1 1 1 1 1 1 1 1 1 1

Since, after a reset, all the component’s ports are configured for input, the

keys can be interrogated without altering the control register.

Example:

- Press keys S5 and S9, and interrogate addresses 220H and 222H at the

same time.

- From address 220H you obtain 11101111B, while 222H returns

XXXXXX10B. The X stands here for an undefined value that need not be

considered.

The LEDs

The 10 special keys each contain a light emitting diode that can be driven

through the software. They are addressed through port B and the upper

half of port C of the same input/output component as the special keys. This

is located in the address range from 220H to 223H.

Inverted drive

Note that drive of the LEDs is inverted, so that if the bit is set, the LED is

out.

The component must be re-

configured for output in the

control register.

Since after a reset all the component’s ports are configured as inputs, the

value 10010001B (= 91H) must be written into the control register at

address 223H before the LEDs are first used, so that port B and the upper

half of port C function as outputs. The configuration is retained until this is

over-written.

Example:

- Write 10010001B (91H) into address 223H.

- In order to switch on LED 6 and to switch all the others off, write DFH to

address 221H and set bits 4 and 5 of address 222H, by writing a value in

which bits 4 and 5 are 1, for instance 30H or FFH.

LEDs 10 9 8 7 6 5 4 3 2 1

Port

Port C Port B

Address

222H 221H

Bit

5 4 7 6 5 4 3 2 1 0

LED on=

0 0 0 0 0 0 0 0 0 0

LED off=

1 1 1 1 1 1 1 1 1 1

1 2 3 4 5 6 7 8 9 10 11 12 13

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