Topview Simulator for Atmel 8031 Microcontrollers

Facility to simulate the complete 8051 microcontroller.
Facility to simulate the architecture, on chip peripherals and many external embedded modules.
Built in Integrated support to use the SDCC C compiler for program development.
Built in Code Editor to support C program development and the assembly code.
Built in Code Debugging facilities to support both C language and the assembly code with Break Point, Single Step and Software Breakpoints.
Built in facility to generate the application code for the embedded modules either in C or in assembly language.
Facility to start and finish the total project in the simulation environment.
Built in Simulation facilities:
Range of Point LEDs and Seven Segment LEDs.
LCD modules of many configurations.
Momentary ON keys.
A variety of keypads up to 4×8 key matrix.
Toggle switches.
All modes of on chip serial port.
IIC components including RTC, EEPROMs.
SPI Bus based EEPROM devices.
Suitable for Atmel AT89CXX Microcontrollers.

Completed Project in simulator
Completed Project in simulator 2


In Circuit Emulator for Atmel 8051 Microcontrollers

Topview In Circuit Emulator is the low cost emulator supporting many of Atmel 8051 microcontroller derivative devices in 40 and 20 pin counts. The Topview ICE comes with a state of art Integrated Development Environment enabling the users troubleshoot the application software and the hardware in real time with ease and confidence. The IDE has built-in program editor, device template generator and the debugging facilities. The emulator has the facility to debug source level debugging facilities for both C and ASM programs. Other features like on line assembler, dis-assembler, software trace, break point options make the emulator very much versatile for very complicated applications.

In short, the Topview ICE is the advanced development tool that will reduce the project time to a large extent enabling the designers undertake more projects than before.


Supported Devices: Atmel 8051 Microcontrollers with on chip flash memory in a single chip

List of devices:

AT89C1051, AT89C1051U, AT89C2051, AT89C4051, AT89C51, AT89C51RC, AT89S51, AT89C52, AT89S52, AT89C55, AT89C55WD, AT89S53, AT89S8252, AT89S8253.

Real time operations upto 24MHz.

Operating clock options: The emulator uses either built in clock or any other clock source connected with the target microcontroller. The built in clock oscillator generates a range of clock options: 4 MHz, 4.608 MHz, 8 MHz, 9.216 MHz, 10 MHz, 12 MHz, 16 MHz, 18.432MHz, 20 MHz and 24MHz.
5V operation.
Supports upto 64 KBytes of Program Memory.
Supports upto 256 Bytes of internal Data Memory.
Supporting both 20 and 40 pin DIP devices.
Connected with PC through USB port.
Topview IDE runs under WinXP environment.


Emulation Memory: Topview ICE-B provides 64Kbytes of space for the program memory.

Software BreakPoints: Software BreakPoints allow the real time program execution until the specific program line.

Conditional BreakPoints: A set of conditional breakpoints permit the program halting during the emulation based on specific code address, source code lines and the register contents.

Language and file formats: Topview ICE – B accepts files with many formats. It also accepts different assemblers and C languages. For the ASM program, Intel Hex format is accepted. For the C environment, both KEIL and SDCC compilers are supported.

Source Level Debugging: The Topview IDE comes with a Source Level Debugger which helps the designers debug the application code generated by both the assembler and the C language. This debugger includes the commands to generate all the required information during the program and hardware testing in real time. The commands permit setting breakpoints based on high level language lines, adding a watch window with symbols and variables of interest, modifying the variables, executing assembly steps and many more useful functions.

Topview Trainer for 8051 Microcontrollers

Topview Trainer was another interesting and useful study tool we developed for the 8031 /8051 microcontrollers. The hardware was designed to be the minimum with basic features to save on the cost. But, the software features were really outstanding with all the required debugging options. The internal details of the controller were presented in a most effective way to make the understanding on the program flow an easy and enjoyable experience. Because of the cost and the useful software debugging features, the Topview Trainer became popular with the educational institutions. Those days, debugging features were available only with high-priced trainers only.

We started selling these trainers with an attractive cost of only Rs3500/. As usual, it was promoted with Money-Back Guarantee.

We could sell a decent volume of these trainers and then it was slowly discontinued from our manufacturing.

Low cost learning tool for world’s popular 8031 Microcontroller Family.

Atmel AT89C52 operating at 12 MHz.

32K Byte SRAM for user’s applications with Battery backup.

Optional 32K Byte EPROM for user’s application program.

6 Digits of 7 Segment Green Colour Displays.

24 High Performance keys.

All standard trainer facilities are available.

LEDs, Push Button Switches are available for user’s experiments.

Facility to study interrupts structure and Timer/Counter of the Microcontroller.

Bus lines and I/O lines are terminated for user’s convenience.

Including Suitable Power Supply.

Free world class Topview Debugger that saves 30% of your project development time.

No other trainer in India has this facility.

Complimentary CDROM with useful documentation and utilities.

Bundle Contents:

Topview Trainer.
CDROM with Debugger software and other useful documents and software.
Power Supply.
Serial Port Communicating Cable.
Topview Trainer Hardware User Guide.
Topview Debugger Software User Guide.
Software Examples Manual.

Topview Debugger is the most advanced debugging software made available in 8031 microcontroller based trainers.

Best available tool for the students. After using Debugger for few hours, students can accelerate software development by atleast 40% when doing their projects.

Topview Debugger is extremely popular among our customers. It is the proven tool appreciated by our industrial customers who demand only the best. Our customers use Topview Debugger for many years. No one ever regretted for purchasing the tool.

If you are serious in doing anything on 8031, the Topview Debugger is the best thing made available to you.

Topview Debugger

Topview Debugger is the most important facility meant for developing 8031microcontroller based Embedded Solutions. Debugging is an inevitable part in any development environment to implement applications in real time. A right debugging tool should save a lot of development time.

Topview Debugger gives you unmatched power to manage 8031 based projects.

This debugger is a two part program in which the major part stays inside of the Topview trainer that keeps track of internal operation of the microcontrollers. During program execution, it catches information on various registers contents, internal/external memory areas and also various peripherals of the microcontrollers. This information is later transferred to the host computer to which it is connected.

Second part of the debugger operates in the host computer and is responsible for presenting the information received from the trainer in a most useful format using a GUI environment.

The debugger presents a GUI environment in which the clearview window structure gives facility for viewing/editing Program Memory, Internal Data Memory, information on various internal registers, SFR bits and etc.

When you use clearview windows you can visualize all the changes happening in the microcontroller’s internal architecture in a single screen. You can verify the internal, external memory spaces, various registers, SFR bits, along with the program code lines.

Another important feature of the debugger is the built-in program editing facility with the provision to run an external assembler for assembling the edited input program file.

You can compose your target program in this editor and send the edited code into the assembler and get the assembled code in a single shot.

There is an option to load the assembled code into the Trainer’s Program Memory at the predefined location.

All this happens in a single step for your convenience.

In the Program Memory window, the address, opcodes and mnemonics with SFR names are displayed line by line with distinct colours.

The Program Memory sports a single line assembler. So you can simply enter your program line by line using mnemonics.

The window also disassembles the hex input file and generates the actual assembly program.

You can also download a binary or hex file in the Program Memory of the Trainer reading from the disk.

Similarly, you can store the contents of the Program Memory into the disk either in hex or binary format.

In the internal Data Memory window, you can view/edit the memory contents. Facility is provided to Fill and Copy internal Data Memory contents.

External Data Memory window also supports all the above mentioned and also sports the facility to test the external Data Memory space.

In the Register and SFR window, the names of all register are clearly displayed to make you life easy during repeated debugging.

There are many ways in which you control the program execution to suit your needs. During every break, all the windows update their contents and indicate the changed values in a different colour to grab your attention.

You can execute the total program in a single shot and then check for the desired results.

You can also execute your program upto a Breakpoint and then verify the contents of various registers and the memory. The breakpoint can be defined using registers, internal Data Memory, SFR bits, External Data Memory.

There is another useful feature available to execute the subroutines in a single step. You need not execute a subroutine block line by line.

Having described the debugger in detail, we are sure that you understand the clear advantage you get when implementing your next embedded solution using Topview Debugger.

We once again remind you that a good debugging tool may save you from many hours of frustration. You can also finish the project before the anticipated time.

Our experience shows that at least you can save about 30% of the development time when using this powerful debugger.

Customer’s feedback on the trainer after 15 years of using.


Topview Device Programmer

Even though we had many products before this one, only after launching this, we became known to the embedded system community of India. We gave a good programming tool with an attractive and unmatched cost. The launch price was Rs 2002, the figure matching the year we started selling this. At that time, even programmers costing many times more didn’t come with similar features. To give buyers confidence, we started selling these programmers with a 15 days Money back-Guarantee, which was a new idea at that time. We also kept all details on line for the users’ evaluation. The combination of all these things made this device programmer very popular with the users and it became an instant hit for us.

Even after selling few thousands of this programmer, we never had any customer returning this programmer to get his/her money back.

We still come across customers who talk fondly about this programmer and there are good number of customers who started their career using this programmer.

We are really very happy about this Device Programmer, right from the day of its design till now. Now, we stopped manufacturing them.

Here comes more details about this programmer………..

Topview Device Programmer.

Topview Device Programmer supports all the devices in 8031 family of Atmel, AT89CXX. The programmer supports both parallel and SPI programming for user’s convenience. A powerful windows based GUI facility is available. Apart from this, many new features are made available to make the programming task an easy one.

Supported Devices:
20 Pins:
AT89C1051,AT89C1051U, AT89C2051, AT89C4051.

40 Pins:
AT89C51, AT89LV51, AT89S51, AT89LS51, AT89C52, AT89LV52, AT89S52, AT89LS52, AT89C55, AT89LV55, AT89S53, AT89LS53 AT89S8252, AT89LS8252.

Programmer can be connected to the PC through the serial port : COM1 to COM4

Supports both Parallel and SPI Programming.

Facility is available to program the device soldered in the target hardware through SPI bus. This facility is available in devices: AT89S51, AT89LS51, AT89S52, AT89LS52, AT89S8252, AT89LS8252, AT89S53, AT89LS53.

A single 40 pin ZIF socket is there for programming both 20 pin and 40 pin devices.

Programmer comes with suitable power supply and all relevant cables and is ready for usage immediately after opening the pack.

User Feedback

The unit is working fine. The software interface supplied with this is very user friendly and powerful.

I should congratulate Frontline Electronics for supplying such a fine product.

I could see the professional touch in all respects (right from documents on software to PCB finish).


Your product is superb. I appreciate the workmanship and the choice of electronic components for the product.

Really you and your engineers have done a good job for the embedded system designers.

The programmer is really an engineer’s choice for its price, size and ease of using.

Subrata Bhattacharya,

Graphic user interface facility is good compared to other programmers.

Colour syntax gives better effect in viewing the program code.

Program read option from microcontroller is useful. It also makes us feel convenient since it generates equivalent assembly code.

Programmer is compact and easy to use. the provision of reset key is useful since it is not necessary to switch off the power supply as in case of other programmers.

The user manual provides sufficient exposure to handle programmer efficiently and use the software to maximum extent.

The cost is cheap compared to other programmers. It is 50% less than compared to others.

Few chips, which were rejected by other programmers, have been able to be programmed by this programmer.

Edit EEPROM buffer, Single byte programmer option is one of its kind.

Protecting device, device options, auto-programming mode, read EEPROM, clear EEPROM, all are good.

Dr.Raja Paul Perinbam,

Very Good hardware. Very user friendly software.

GUI facility: Up-to date techniques.

Ease of use: Menu driven and self-explanatory. I will recommend this to my colleagues and friends.


Nice Hardware. Nice Software. Very easy. Very supportive.


Hardware is Ok. Good Software. Excellent GUI facility. Can be easily used.

Dr.Jagdale Shirish Hari,
Karad, Maharashtra.

Hardware is very clean. Good documentation. The programmer is very good. Unique facility to program the in-built EEPROM in AT89S8252 and SPI interface.

Mayur Kannavar,