Remote-processing RPC-220 Manual de usuario descargar pdf (Pagina 15)

WRITING, DEBUGGING, AND SAVING PROGRAMS SECTION 3

Page 3-4

All internal memory from 0 to FFH are displayed.

DP D isplay I/O port

Addresses for I/O devices (and monitor EPROM)

are show n in the I/O memory m ap above. This

comm and autom atically sets the I/ O control CPU bit

P4.0. The DP command is used to access I/O

devices (RTC , expansion). C ommand format is:

DP address<cr>

You can view the contents of the monitor EPROM

in U3 using this command. T he address is from 0

to 0x7fff.

DR Display Registers

CPU registers A, B, R0-R7, DPTR, CPU ports P1

and P3, stack pointer (SP), program status word

(PS), interrupt (IE), and program counter (PC) are

displayed. These registers are displayed after a

program break is encountered and are loaded on a

GOTO command.

When using this command after a power up or push

button reset, certain registers default to a variety of

states. The SP is always 7, DPTR and PSW (PS) are

0. P1 and P 3 are set to a state that forces bank 0 and

memory segment. Additionally, the PC (program

counter) is not valid. Command format is simply:

The term inal outputs:

A B R0 R1 R2 R3 R4 R5 R6 R7 P1 P3 PS SP DPTR IE PC

12 34 56 78 9A BC DE F0 12 34 C7 CE 04 4E 0123 00 2114

Numbers under the registers are for illustration only.

Upon reset or program break, register values are stored

in external RAM. Register values after reset reflect

default conditions. PC is not reliable and IE is always 0.

Registers may be modified using the MX command. The

starting address is displayed on a break command.

DS Display SF R' s

Special function registers are accessed by the DS

command. F ormat is:

A < cr> is not necessary.

Special function registers are those between 80H - FFH.

These include timers, A and B accumulators, P SW, and

other registers. Since ther e are only 128 locations, 8

lines are displayed. This command is different from DR

in that the current contents is displayed. DR shows those

saved after a break or

reset.

NOTE: A short program is run from RAM at address

0xfffa to directly access these registers. You

may have to reload your program after

executing this command.

Modify Commands

There are 4 com mands to modify memory, r egisters, or

I/O:

MX Modify eXternal memory

MI Modify Internal memory

MS Modify Special function registers

MO Modify I/O

Data or status to be mo dified is displayed one byte at a

time. The memory segment, if appropriate, is displayed

at the start of the line followed by its address. The

current data is then displayed. If the data is modified or

skipped (by pressing the space bar), the next address and

its data is displayed. A max imum of 4 addresses and data

are displayed on a line.

For example, MX can display the following at address

0x0000:

00:0000 0A 0001 0D 03 0002 52 43 0003 43 51

Segment:address is first displayed followed by the

current data at that address. If < space> is hit, nothing

is modified and the next address and data are displayed.

To modify, simply enter the new value.

Addresses and data are displayed in hex notation.

Modifications are entered in hex.

Data is modified or not modified depending upon the

number of data characters entered, if any, and type of

continuation character hit. Pressing < space> always

continues to the next address. If any characters were

entered, then data at the address displayed gets modified

by the value displayed. If no characters were entered,

then no modifications are made. Pressing < Enter>

ends the modification routine. If any digits were

entered, then data at the last address is modified.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 46 47

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