Remote-processing RPC-220 Manual de usuario descargar pdf (Pagina 17)

WRITING, DEBUGGING, AND SAVING PROGRAMS SECTION 3

Page 3-6

If the download process gets stuck, y ou can press

the < esc> key at any tim e after the download is

aborted. You can also press the reset button.

Pressing the < esc> key at any time during the

download process aborts the re ceiving process.

G GOTO Run Program

Once a program is downloaded into RAM and

breakpoints are optionally set, it is executed using

the 'G' command. T he application program has

complete control. The only w ay to stop execution is

to press the reset switch or the progr am hits a

breakpoint. Comm and syntax is:

G [address]

When GOTO is executed, r egister values from the

last break or reset are loaded first. T hen the

program is executed. This way you can stop

program execution, examine registers, and continue.

Registers may be modified before e xecuting. This is

done using the MX command. Register values are

stored beginning at the address shown when a Break

is executed. Values are stored in the same order as

they are displayed.

Using G into an interrupt section may be tricky,

depending upon its type. The problem is when

interrupts are re-enabled, it may execute the same

program you executed a break. Unless your program

is recursive, variables may be unreliable.

B Set / Clear Bre akpoint

A program may be interrupted and the contents of

certain registers displayed when a specified addr ess

is reached. Up to 8 breakpoints, numbered 0-7, are

allowed. Comm and syntax is:

B number[,address]

number is from 0 to 7. A num ber larger than 7

aborts the command. If address is 0 or left out, the

contents of RAM at the breakpoint number is

restored to its original values. This is the same as

clearing a break point.

This com mand w orks by r eplacing 3 bytes in

external RAM memory at address and r eplacing it

with a CALL to the monitor break point handler.

When a break point is encountered, interrupts are

turned off and contents of registers A, B, DPTR,

P1, P3, P SW, SP, and R0-R7 are saved and

displayed. Additionally, the address where the break

occurred is also displayed. RAM at the break point

address is not restor ed until a ' B number ' is

executed.

As a general rule, external memory is not affected

by a push button reset or break point. Thus, if your

program hangs up you may restore a break point

and replace it at a new address. The following

illustrates an example. Suppose your code begins as

8000H and you want to set break points at 8112H

and 8215H. Execute the following com mands:

B 0, 8112

B 1, 8215

G 8000

When the code at either 8112H or 8215H is reached, the

break point message is displayed.

**Break Register information at address 7FC0

A B R0 R1 R2 R3 R4 R5 R6 R7 PS SP DPTR PC

03 00 98 00 00 00 00 00 00 21 41 4F 2147 2112

Both breakpoints are still active. To continue execution

from this point you must enter:

B 0

You may then enter a new br eak point or ' G 2112' to

continue.

When a break point is set, 3 bytes from the original

program is stored in RAM. Additionally, the break

address is also stored.

When a program break is executed, certain registers and

I/O conditions are set to a known state. See "REGISTER

USAGE AND INITIALIZATION" above for more

information. You may modify these registers using the

MX comm and. Values for registers are in order as

displayed above. The star ting addre ss for the r egisters is

displayed when a break is encountered. The above

examples is 7FC0.

S Save to flash EPROM

This command is described in detail below.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 46 47

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