Remote-processing RPC-330 Manual do Utilizador descarregar pdf (Página 34)

KEYPAD PORT SECTION 9

Page 9-2 RPC-330

The second example uses ON KEYPAD to generate an

interrupt every time a key is pressed.

10 ON KEYPAD1000

500 GOTO 500

1000 PRINT KEYPAD(0)

1100 RETURN

Line 10 sets up the tasker for keypad interrupts to start at

line 1000. Line 500 loops on itself for demonstration

purposes.

Line 1000 prints out the key pad position pressed.

Elements of the previous program can be com bined with

this one to produce keypad strings.

KEYPAD PORT PIN OUT - J5

The keypad port uses ports B and C from an 82C55.

Lower port C is configured as an input. Upper port C

and port B bits 0 and 1 are outputs.

The table below lists J5' s pin out, 82C55 port and bit,

and its intended function.

Pin 82C55 Function

Port/ bit

1 C/0 Row 1

2 C/6 Column 3

3 C/5 Column 2

4 C/1 Row 2

5 C/2 Row 3

6 C/4 Column 1

7 C/7 Column 4

8 C/3 Row 4

9 B/0 Column 5

10 B/1 Column 6

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 47 48

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Remote-processing RPC-330 Manual do Utilizador Página 34