Peripheral Simulation

For NXP (founded by Philips) P87LPC769 — A/D Converter

Simulation support for this peripheral or feature is comprised of:

• Dialog boxes which display and allow you to change peripheral configuration.
• VTREGs (Virtual Target Registers) which support I/O with the peripheral.

These simulation capabilities are described below.

ADC Dialog

The Analog/Digital Converter dialog displays and allows you to edit the configuration of the A/D converter. The Analog Input Channels, listed at the bottom of the dialog, allow you to specify the voltage for each analog input.

ADx VTREG
Data Type: float

The ADx VTREGs set the analog input voltages for simulated A/D converters. The ADx VTREGs represent the inputs to the analog input pins of the MCU for analog input 0, 1, 2, and so on. AD0 sets the input voltage for analog input #0, AD1 sets the input voltage for analog input #1, etc. If you have properly configured the analog inputs, the following commands (typed in the debugger's Command Window) input the voltages specified.

AD0 = 0.000  /* Analog Input 0 = 0.000 volts */
AD1 = 2.500  /* Analog Input 1 = 2.500 volts */
AD2 = 4.999  /* Analog Input 2 = 4.999 volts */

You may also enter the analog input voltages using the A/D Converter Dialog which is accessable from the Peripherals menu. You may create a debugger signal function to periodically change the value of the A/D input. The following signal function increases the A/D Channel 1 input voltage by 0.1 volts each second.

signal void AD1_sig (void) {
float f;

for (f = 0.0; f < 5.0; f += 0.1)
  {
  swatch (1.0);                  // Delay 1 second
  AD1 = f;                      // Set AD1 Voltage
  }
}

VREF VTREG
Data Type: float