Peripheral Simulation

For NXP (founded by Philips) P89V51RD2 — SPI (Serial Peripheral Interface)

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.

SPI Dialog

SPI_IN VTREG
Data Type: unsigned int

The SPI_IN VTREG contains a byte which is received via the MCU SPI (Serial Peripheral Interface) port on the next SPI transfer. You may use this VTREG in a simulation script. For example:

signal void spi_func (void) {
while (1) {
  wwatch (SPI_OUT);
  printf ("SPI_OUT: %2.2X\n", (unsigned) SPI_OUT);
  SPI_IN = SPI_OUT + 1;
  }
}

This signal function returns the SPI byte send plus 1 on the next SPI transfer.

SPI_OUT VTREG
Data Type: unsigned int

The SPI_OUT VTREG contains a byte output via the MCU SPI (Serial Peripheral Interface) port. When your simulated program sends a byte via SPI, the SPI_OUT VTREG is set with the value output. You may monitor this VTREG in a simulation script. For example:

signal void spi_watcher (void) {
while (1) {
  wwatch (SPI_OUT);
  printf ("SPI_OUT: %2.2X\n", (unsigned) SPI_OUT);
  }
}