Remote-processing RPC-210 Manual de usuario descargar pdf (Pagina 32)

DIGITAL LINES BASIC SECTION 6

Page 6-4

to a more powerful processor such as the RPC-

320.

There are no firm guidelines for what constitutes a

“long” program. You may be able to process more than

20 line changes/Sec. if subroutines are “ short”. (In

theory, the RPC -210 can process 800 line changes/

second). The problem is the time it takes to process a

RPBASIC-52 command. Allowing about 1.5 mSec/

command, it would take about 24 mSec to process 16

interrupts, even if the routines wer e simple returns!

Keep in mind other multi-tasking routines such as ON

COM, ONITR, O NTICK, and ON KEYPAD that can

take up time.

If you exceed RPBA SIC-52' s ability, you are likely to

get an “INVALID L INE NUMBER” er ror in your

program even though the program is just fine and that

line previously executed. What is error really is is an

insidious stack error caused by the CPU stacking up

tasks and not having enough time to do them all.

J5-Keypad

J5 is normally used as a keypad port. Since keypad

scanning is always active, column lines at J5 are strobed

every 100 mSec. Any data written to them will change

within 100 mSec.

If the keypad is not used, rows may be read at any time.

The statement below reads rows 1-6 at J5:

A = LINEB(0A400H) .AND. 63

Data is ANDed to filter out unassociated r ows.

The following table shows the address and bit numbers

for rows and columns.

J5 pin Description Address Bit

1 Row 1 0A400H 0

2 Col 3 0A305H 0

3 Col 2 0A304H 0

4 Row 2 0A400H 1

5 Row 3 0A400H 2

6 Col 1 0A303H 0

7 Col 4 0A306H 0

8 Row 4 0A400H 3

9 Row 6 0A400H 5

10 Row 5 0A400H 4

Rows 5 and 6 are not read by the keypad scan routine.

Port J7

J7 is a potpourri of lines. Interrupts, SPI signals, and

digital I/O lines are among them. This part discusses

only the digital I/O lines.

There are 4 input and 1 output lines at J7. lines are

accessed using the LIN EB statement.

The table below show s the pin numbers, address, and bit

numbers to access I/O lines at J7.

J7 Pin Description Address Bit

2 Input 0A400H 6

6 Input 0A400H 5

10 Output 0A307H 0

17* Input 0A400H 7

19 Input 0A4000H 4

*J7-17 is used for Autorun detection. When low, a

stored program will execute. After the autorun program

is executing, this input may be used for other input

purposes.

The output is set as follows:

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 59 60

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Remote-processing RPC-210 Manual de usuario Pagina 32

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