Peripheral Simulation

For Infineon SAB 80C515A — Watchdog Timer

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.

Watchdog Timer Dialog

The Watchdog Timer dialog shows the current state of the on-chip Watchdog Timer. You can change watchdog settings using the controls in this dialog.

Watchdog Timer

• Timer holds the Watchdog Timer value.
• WDTS (Watchdog Timer Status Flag) is set by hardware when a Watchdog Timer reset occurs.
• WDTREL (Watchdog Timer Reload Register) holds the refresh value for the Watchdog Timer.
• WDTPSEL (Watchdog Timer Prescaler Select) is set to divide the Watchdog Timer clock by 16.
• WDT (Watchdog Timer Refresh Flag) is set to refresh the Watchdog Timer. To perform a refresh, you must set this flag immediately before setting the Watchdog Timer Start Flag (SWDT).
• SWDT (Watchdog Timer Start Flag) is set to activate the Watchdog Timer. Setting this bit directly after setting the Refresh Flag (WDT) refreshes the Watchdog Timer.
• PE_SWD (Start Watchdog Timer) if set during a hardware reset, this bit starts the Watchdog Timer. Setting this bit during normal program execution does not start the Watchdog Timer.

PE_SWD VTREG
Data Type: unsigned char

The PE_SWD VTREG allows you to simulate the behavior of the PE/SWD pin on the simulated MCU. When this pin is set to a high level at reset, the watchdog timer is enabled. When this pin is set to a low lever, the watchdog is disabled. By default, PE_SWD is set to 1 to simulate the on-chip pull-up resistor. This enabled the watchdog timer. To disable the watchdog timer, you must set PE_SWD to 0 and reset the simulated MCU. For example:

1. Create a debugger INI file containing the following commands:

   PE_SWD = 0  /* Disable Watchdog with pin PE_SWD */
   reset       /* Reset the MCU and use value at PE_SWD */
   g, main     /* Run target program until main function */
   

2. Under Options for Target - Debug - Use Simulator, disable the option "Go till main ()" then enter the filename for the debugger INI file you created.