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Chapter
5: FAQ Why
the connection cannot be established under simulation mode?
 1.
USB driver may have not been setup successfully. Please check if it is
OK at: control
panel\system\hardware\device
manager. If you can see the COM port number information shown like
below photo. If not, please reinstall the USB driver or change to
another PC and have a try: sometimes, if the USB port number is
changed, USB driver should also be reinstalled.
 2
Simulation needs KEIL uv2 version 7.0 or higher version, ( Note some
early version is not compatible), also the software must be installed
under C:\ root directory, can not be other directory! When creating
new file, DO NOT save it in other directory, also no Chinese character
file name. Please strictly follow [1-8 ascii char].xxx filename style.
 3
Make sure the COM port selection is correct (If it is a new system
that have not been installed other USB device before, then the COM
number should be COM3). Because simulation and programming both need
COM port, so when doing simulation, please close XLISP programming or
other similar debugging software that may occupy some COM port.
 4.
Make sure the simulator is reset well. Please press down the reset
button. We can find a single green flash and a sound from speaker and this
means the system is reset. When assert a long press on the reset
button(more than 3 second), we can find continuous green flash and two
sounds from speaker, this means the system is running offline.
 5.
Check if the oscillation frequency is setup OK. One an only one
frequency can be set.
 6.
Check if the simulator cap insertion direction is correct. Pay
attention to make the first PIN of the cap(red) align to first pin of
the CPU. If the direction is invert, the system may become hot and
light is dusky. Please change the direction immediately.
 7.
Your target board may not works well, maybe no correct clock and reset
on it. You can test it by burning a program into the chip, if the
burning is OK, it means the target board is correct.
 8.
Need extra power for target board? Simulator
cap could provide 5v/500ma power supply for the target board, in
case, it is enough. If you fell it is not enough, you can
provide an extra 5V power by yourself. The system is designed for
protecting it from too high voltage power supply.
 9.
Why some port is not active? Maybe
the simulator cap connection is not tight. If possible, please unpack
the simulator and have a measure on it by a multimeter.
 10.Is
the clock and reset of the target board is still functional? When
using 51TRACER simulator, the clock and reset of the target board is
taken over by the simulator.
 11.
Why the program is not stable? Please
insert one line before main() function if C code:
char code dx516[3] _at_ 0x003b; Please
Skip interruption vector area until 0050H if ASM code, like:
org 0000H
ljmp
main
org
0050H
main：....;
program starting point If
you do not follow above instruction, when loading program, the
simulator will generate “dididi”alarm sound and the simulation
result maybe not correct. As
the development of the single chip machine technology, 00~40H is
occupied by more and more new registers, not the original 00~30H. If
your program is still 30H, please adjust it to 40H or 50H, 80H. If you
have any question about it, please refer the program examples in the
CD, they are all tested.
 12.
If cannot make certain what is wrong with it, please long press down
the reset button to offline running mode. If the program still does
not work well, please check your program.
 13.
If you want to simulate 2051, please refer to the pin definitions of
2051 and 51 and try to make an interface adaptor. Usually, we suggest
you just use the 51 simulation and avoid the resources that not exist
in 2051. Below
is the photo of simulator-XL2000 connection (connect USB to PC, simulator to target board, note
the frequency)
 51TRACER
simulating XL2000 photo
| 
user manual
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