The user can set the number of instructions executed between updates to the simulator GUI by selecting a value from the Update Freq. menu. Certain update. Instructions are coloured blue, assembler directives (such as ORG, USING, etc) are As with many microcontroller simulators, EdSim51 allows the user to either . User Manual. James Kelly 3) Download om/ simulator/ the user may pause the program by clicking the button again.

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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. When the simulator is launched it tries to open this file. You can select code in the assembly text area and copy it to the system clipboard using the Copy button, the same as you do in your word processing package.

More information on the keypad modes and the keypad interrupt. The high nibble is sent first, followed by the low nibble. A breakpoint can be set by double-clicking the instruction’s address, as shown in the images below. The PSW is bit-addressable, therefore the background of each bit is white and the user can change any of the bits directly.

The UART can also transmit a set of 8-bit data instead of text.

Edsim51 Examples

When stepping through the code, move the mouse over the address of the instruction and double-click. The keys can also be set to simulate switch bouncing – more info. When stepping through the code, the instruction that was just executed is shown in the grey box at the top, together with the instruction’s address example shown: If the file does not exist or is corrupted in some way, it is ignored and the simulator is launched with the original settings.

If the file exists then the information in it is used to restore the system settings to the values they were at when the simulator was last shut down. It gguide not link multiple files and only some of the directives you might expect are implemented.

Yser you should use busy-waiting on the keypad. LJMP rel must be programmed explicitly. Data can be transmitted to the ‘s serial port by typing text in the Tx window and clicking on the Tx Send button, which initiates transmission. Any number of keys can be closed at the same time. As in standard mode, a closed key usdr reopened simply by clicking on it again.


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. Up until now, uuser external UART only transmitted text – whatever the user typed in the Tx field was transmitted to the The following code extract illustrates this point: When the conversion is complete the INTR line goes low and remains low until another conversion is initiated. Pulse – in pulse mode a key is closed while the left mouse button is held down.

EdSim51 – User’s Guide

The top three bits determine which of the eight CGRAM characters is being written guode, while the bottom three bits determine which of the eight rows of this character is being written to. When the motor’s shaft guied up with the sensor, the sensor changes from black to red, as shown in the image on the right.

Notice the sensor depicted by a vertical line at the top of the motor is black. By default, this is the format used when saving your source code in the EdSim51 Simulator. The zoom guidde is located below the red Exit button. The data in this window can be cleared at any time by clicking the Rx Reset button. The speed of the motor can be varied manually using the slider to the right of the motor – take a look at the hardware screenshots above.

Now the user can enter a value for the system clock frequency in MHz. When text is transmitted, it is terminated by 0DH. The programmer can write code directly here, or can load a program from file using the Load button dealt with in the next section. Radio – in radio mode only one key at a time can be closed.

This program runs in a continuous loop, displaying the numbers 0 to 9 and back to 0 on the first 7-segment display. The user can choose to either step through a program executing a single instruction per step or run the program continuously. The motor can be disabled by clicking on the Motor Enabled button.


This is because the TMOD register is not bit-addressable – the user cannot alter these bits directly. There are two file types handled. The decoder is enabled via a logic 1 on P0. When a switch is open a logic 1 appears on the port pin via the pull-up resistor while closing the switch connects the pin directly to ground – logic 0. Goes to logic 0 when conversion is gyide and remains low until another conversion is initiated. The 4 X 3 keypad is interfaced in a standard format, as can be seen in gudie logic diagram extract above.

Also, the program counter is not editable. Standard – in standard mode the keys are independent of each other. For the entered number to take effect, the user must hit Enter on the computer keyboard. A screenshot of the microcontroller panel. When stepping through or running code, the length of time that passes is not only experienced by thebut by all the peripherals as well.

To do so, the user encloses the set in curly braces, each number separated by a comma, edsij51 shown in the image opposite. The example on page 42 is for a 1-line display, but it nonetheless explains clearly how to initialise and communicate with the module in 4-bit mode. As it is positive edge usfr, it must be taken low and then high to start a conversion. Instructions for reading from the module have not been implemented.

In this way the programmer knows at a glance if the module is in blinking mode when not ecsim51 blinking mode, all characters are black with grey background. In the image on the left, the motor’s shaft is in the default position pointing at 3 usee. The programmer can then step through the code, or run the program, from that point.

This can then be pasted elsewhere in the assembly text area, using the Paste button if the text area is editable – white background – if it is not, click Reset.

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