3) Download om/simulator/ “Assm” is used to manually step through the code and observe individual steps. Veja grátis o arquivo The EdSim51 Beginner’s Guide to the enviado para a disciplina de Microcontroladores Categoria: Outros – 2 – The Paperback of the EdSim51’s Guide to the core of the popular 51 series of 8-bit microcontrollers by James Rogers at Barnes & Noble.

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Using the Update Freq. Or, if none of these options is appropriate, the user can type in a number, then hit Enter. There are two file types handled.

The first is plain-text. Assembly programs are saved as regular plain-text files often called text-only and usually with.

EdSim51 – User’s Guide

By default, this is the format used when saving your source code in the EdSim51 Simulator. When stepping through the code, move the mouse over the address of the instruction and double-click. To remove the breakpoint, move the mouse over the instruction’s address and double-click. Alternatively, you can remove all breakpoints with one click of: An example for port 2 is shown below.

As can be seen in the diagram below, the LED bank, the DAC inputs and the 7-segment display data lines all share port 1.

When a switch is open a logic 1 appears on the port edim51 via the pull-up resistor while closing the switch connects the pin directly to ground – logic 0. The switch bank and the outputs of the ADC are applied to port 2. Therefore, it should be noted that when the ADC is being used the switches in the switch bank should all be open in the simulator, the switches are blue when they are open. If a switch is closed edsm51 doesn’t matter what the ADC tries to put on that line, the line is held low because it is connected directly to ground through the closed switch.

Manua, analogue input that is applied to the ADC is also applied to the non-inverting pin of the comparator, as can be seen above in this extract, since the ADC is disabled, the analogue voltage connection to the ADC is omitted. When this button is clicked the title changes mqnual Comparator Enabled and the input voltage slider’s title changes from ADC to Comparatoras shown opposite.

This corresponds to the switch at the ADC chip select and the switch between the comparator output and P3. By default, the ADC is enabled and the comparator output is isolated. In the logic diagram extract above you can see the switch between the comparator output and P3. In the image on the left, the motor’s shaft is in the default position pointing at 3 o’clock. Notice the sensor depicted by a vertical line at the top of the motor is black.

When the motor’s shaft lines up with the sensor, the sensor changes from black to red, as shown in the image on the right. Data received from the ‘s serial port appears in the Rx window. The data in this window can be cleared at any time by clicking the Rx Reset button. Copyright c James Rogers. Beginner’s Guide to the – Online. Get the latest EdSim51 version.

Syntax Highlighting Now, assembly code written in EdSim51 is automatically syntax highlighted. Switching off syntax highlighting: Change the System Clock Frequency. Originally, the simulator ran with a system clock frequency of 12 MHz. Now the user can enter a value for the system clock frequency in MHz. Acceptable values are in the range 0.


Up until now, the external UART only transmitted text – whatever the user typed in the Tx field was transmitted to the Now, a set of 8-bit numbers written in HEX can be transmitted.

To do so, the user encloses the set in curly braces, each number separated by a comma, as shown in the image opposite. When text is transmitted, it is terminated by 0DH. This is not the case with a set of numbers. In the example shown opposite, the four numbers 56, 3a, 23 and e7 are transmitted, nothing more. For high resolution monitors, click on the zoom button.

The zoom button is located below the red Exit button. Standard – any number of keys can be closed at the same time. Pulse – once the mouse button is released the key reopens. Radio – in radio mode only one key at a time can be closed. Until now the keypad could only be implemented using busy-waiting. It can still be implemented in that manner, but it can also be used together with the external 1 interrupt pin, P3. To multiplex the displays and use the keypad at the same time, the keypad must be implemented using busy waiting.

More information on the keypad modes and the keypad interrupt. You can now save your source code in Intel HEX format. Now the user can choose from a list of Baud rates. This allows the student to experiment with different Baud rates and to learn how the ‘s serial port, Timer 1 and the SMOD bit are used together to generate the required Baud rate for more information on the serial port, see our Beginner’s Guide to the – Serial Port.

The default Baud rate is The user can select from a list of standard Baud rates, as shown above. As with many microcontroller simulators, EdSim51 allows the user to either step through a program, executing a single instruction per step, or to run the program continuously. In the original EdSim51 design, when running a program, the simulator would execute one instruction, update the screen, pause for a quarter second, then proceed with the next instruction and so on.

This allowed the programmer to observe changes in the hardware and registers for each executed instruction. However, while this is very useful for debugging, it meant the user would need to wait a long time for things to happen examples: The best of both: Type in a value: Therefore, the user can now enter a number rather than select a value from the list.

For the entered number to take effect, the user must hit Enter on the computer keyboard. A screenshot of the microcontroller panel. This gives the user access to all majual ‘s registers and data memory. Boxes that are white can be edited directly.

Those that are grey cannot. For example, the port latch bits can be edited directly by the user, but the port pins are controlled by the external peripherals and the port latches and cannot be edited.

Also, the program counter is not editable. When the mouse pointer is left to hover over one of the register labels, the register’s address appears, as shown opposite for the PCON register. edsum51

The EdSim51 Beginner’s Guide to the 8051

In the above image, the individual bits for the accumulator are shown ACC. The user can enter any address or SFR name in the blue box replacing ACC and the bits for that given address will edsjm51 be displayed.


Also, if you let the mouse pointer hover over one of the bits momentarily, the bit’s description is displayed, as shown below:.

Also notice the background is grey. This is because the TMOD register is not bit-addressable – the user cannot alter these bits directly. The PSW is bit-addressable, therefore the background of each bit is white and the user can change any of the bits directly. The bitfield can be used to see the bit pattern of any address in RAM 0 to 7FH by typing the address in the blue box.

If the location is bit-addressable, the bit backgrounds are white and the user can alter any of the eight bits. By default, data memory is displayed. Any address in RAM 00H to 7FH can be altered by entering the address in the blue box labelled addr and then entering the desired value in the box to the right labelled value. Code memory can also be examined and edited, as shown in the image above. To switch between data memory and code memory the user clicks on the button that is labelled Data Memory when data memory is displayed and Code Memory when code memory is displayed.

The first bytes of code memory are displayed. To view another area of code memory, enter the start address in the blue box. The bytes from the start address onwards will then be displayed. Again, like data memory, the address specified in the blue addr box can be altered by entering a value in the value box. However, it should be noted that this will result in the machine code and the assembly program being different. In the image above, the assembly code that generated the machine code as displayed in code memory can be seen on the right.

The user can choose to either step through a program executing a single instruction per step or run the program continuously. When running a program, the rate at which the screen updates is determined by the setting in the Update Freq. The update frequency may be changed while a user’s program is running. A simple assembly program is shown in the assembly code panel to the left. This program runs in a continuous loop, displaying the numbers 0 to 9 and back to 0 on the first 7-segment display.

A snapshot of its execution is shown to the right. When the background of the assembly code text area is white is it editable. The programmer can write code directly here, or can load a program from file using the Load button dealt with in the next section.

When the program is ready for testing, the user can either click on the Step button to execute instructions one at a time, or on the Run button to run the program continuously.

Either way, the program will first be assembled. If an error in the code is discovered, a message is displayed in the message box above the assembly code with a red background and the line with the error is highlighted within the code in red. If the code assembles without errors the text area’s background changes to light grey.