Ceibo - EB-51 FAQ

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FAQs about EB-51

ROMless Operation

1. How does the system work in ROMless mode?

ROMless operation means that the chip selected is 80C31, 80Cxx, etc., and ports 0 and 2 are the bus. P3.6 and P3.7 can only be used as RD/WR lines. Port 0 can only be used as AD0-7 address/data bus lines. Port 2 can only be used as A8-15 address lines.

ROMed Operation

2. How does the system work in ROMed mode?

ROMed operation means that the chip selected is 83Cxx, 87Cxx, 80C51, etc., and ports 0 and 2 are I/O ports. P3.6 and P3.7 cannot be used. Port 0 can only be used as I/O port. Port 2 can only be used as I/O port. Any MOVX instruction is not supported and must not be used.

Ports

3. I cannot access (read or write) Port 0 and 2.

Select chip type ROMed (like 87C51) and not ROMless (like 80C31).

4. By writing MOV port3,#0 the system does not work.

Write MOV port3,#c0h, because you cannot write to port 3, bits 6 and 7. The other bits of Port 3 do not have limitations.

5. I do not know how to use port 3.6 and 3.7.

These ports can never be used as I/O ports on the EB-51. They can be used only as RD and WR lines.

6. I do not know how to use Port 2.

MOVX @Ri instruction is not supported in regards to Port 2 operation. That means, you cannot use Port 0 as a bus and Port 2 as a Port; work with both as ports or as buses.

Timers

7. How many timer ticks are lost while stopping the emulation and reassuming it?

Up to 50 timer ticks, depending on the timer mode and frequency. Microcontroller

8. I replaced the microcontroller and the system does not work.

EB-51 may accept many different derivatives. EB-51 uses standard microcontrollers working in emulation mode. This special mode used by the emulator in ROMed mode, outputs the internal buses and it is not documented in the Philips Microcontroller Data Book. Programming the security bits is the operation required by the chip to accept entering in the emulation mode. If you cannot program the security bits or you are not using a Philips microcontroller, select in the software menu a ROMless type (i.e. 80C32, 80C51FA, etc.) and not ROMed (i.e. 87C51FB, 87C...., etc.).

9. Which security bits should I program, if I replace the microcontroller ?

Use Philips microcontrollers and program lock bit 1 and 2 only. Do not program lock bit 3.

10. How can I program security bits ?

Use Ceibo MP-51 or any other programmer with similar capabilities.

Daughter Board

11. I am trying to use Ceibo 552 daughter board for EB-51 and the system does not work.

Check that the daughter board is properly connected. Use the power switch only in 5V and not 3.3V. Set the frequency to 12MHz and not 24MHz or higher.

System Problems

12. EB-51 works at 5V but not at 3.3V.

You do not have the chip set for 3.3V operation (the set is U1 to U4 and they are "L" devices and not "C").

13. Yesterday I worked with the system and it was OK. Today the ports are not showing any activity.

The software has been invoked without a system connected to the power supply; then the mode has changed from Emulation to Simulation and therefore you are working only with the simulator.

14. I cannot establish a communication between the system and my PC, although the serial port of my computer works with another system as well as the serial cable.

1. A cable from another system may be the problem. Use only the black cable supplied with the system.

2. Set the Power Switch to 5V. Maybe you do not have the 3.3V chip set.

3. Your PC does not support the high baud rate. Try to set the baud rate to low in the Options Menu.

15. The system shows always Error #6 - crystal problems.

Set the crystal jumper to Internal.

Software

16. Why cannot Port 0 and 2 be accessed in the watches window, etc. ?

Select chip type ROMed (like 87C51) and not ROMless (like 80C31).

17. Why some options are grayed out?

Not available yet in the current software version.

18. I am using BSO/Tasking assembler and when I try to enter a symbol in the Watches window, I get Error #311 and the values of the variable are represented as question marks (?????).

This assembler and many others are case sensitive, so enter the variable manually and always in upper case.

19. I cannot open the Module Window.

You did not load a file with DEBUG information. Check again how the file has been generated and if you selected the appropriate vendor in the Load command.

20. I press Ctrl-Break and the program does not halt.

If you try to halt your program with the Halt command (Ctrl-Break), and the Debugger continues to Run, it means that the selected Halt Mechanism Interrupt did not occur. The Debugger will only Halt the next time the selected Halt Mechanism Interrupt occurs. Executing the Reset command (Ctrl-F2) after executing the Halt command and before the Debugger is Halted will force the user program to Halt by forcing the Reset Halt Mechanism.

21. How can I see the modules list in Ceibo's Debuggers ?

1. Make sure, that the absolute file includes debug info.

2. If the source files and the absolute files are not located in the same directory, set properly path for source files, using menu item 'Options->Path for source' in Ceibo Debugger.

3. If you still cannot see the modules, find it yourself.
1)Open dialog window 'Options->Module list file';
2)press button 'File find...';
3)check the checkbox 'Absolute path'from the right of the dialog window;
4)change file type to 'all files(*.*)';
5)find your file and choose it;
6)press OK(you will see the choosen module with * from the left);
7)click on the module and press OK;
8)go to the 'View->Module'window(the menu 'Module' will be active);
9)click on the module and you can debug;

4.Notes: you need the files with extension .lst only if you deal with PLM language.

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