Peripheral Simulation

For Infineon XC878L-16FF — External Interrupt Inputs + NMI Control

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.

External / NMI Control Dialog

The External / NMI Control Dialog shows the current state of the on-chip external interrupt and non-maskable interrupt controllers. You may change the configuration of these controllers using the controls in this dialog.

External

• EXICON0 (External Interrupt Control Register 0) holds the parameters that control the external interrupts 0-3 (EXINT0-EXITN3).
• EXICON1 (External Interrupt Control Register 1) holds the parameters that control the external interrupts 4-6 (EXINT4-EXITN6).
• EXINTx (External Interrupts 0-6 Trigger Select) selects the interrupt to occur with a falling edge, rising edge or falling edge and rising edge.

NMI

• NMICON (NMI Control Register) holds the following settings:
• NMIWDT Enables the Watchdog Timer NMI.
• NMIFLASH Enables the Flash Timer NMI.
• NMIVDD VDD Prewarning NMI.
• NMIECC Enables the Error Correction Code NMI.
• NMIPLL Enables the Phase-Locked Loop Loss of Lock NMI.
• NMIOCDS Enables the On-Chip Debug Support NMI.
• NMIVDDP Enables the VDDP Prewarning NMI.
• NMISR (NMI Status Register) holds the following status bits:
• FNMIWDT (Watchdog Timer NMI Flag) is set when a watchdog timer prewarning occurs.
• FNMIFLASH (Flash Timer NMI Flag) is set when the flash time overflows.
• FNMIVDD (VDD Prewarning NMI Flag) is set when the VDD is below 2.3 volts.
• FNMIECC (ECC NMI Flag) is set when an Error Correction Code error occurs.
• FNMIPLL (PLL NMI Flag) when set, indicates that the Phase-Locked Loop has lost the lock on the external oscillator.
• FNMIOCDS (OCDS NMI Flag) is set when a JTAG-receiving or user interrupt is requested in monitor mode.
• FNMIVDDP (VDDP Prewarning NMI Flag) is set when the VDD is below 4.0 volts on 5.0 volt power.

Interrupt Request

• IRCON0 (Interrupt Request Register 0) Bits 0-6 are set in this register to indicate an interrupt request is active for External Interrupt 0-6, respectively.
• IRCON1 (Interrupt Request Register 1) indicates active requests for SSC Error(EIR), SSC Transmit(TIR), SSC Receive(RIR) and both ADC interrupts.

NMI VTREG
Data Type: unsigned char

THE NMI VTREG contains the state of the NMI pin on the simulated MCU. Normally, the NMI pin is high (indicating that there is no non-maskable interrupt condition). NMI goes low to signal a non-maskable interrupt. Enter the following in the Command window to trigger an NMI Trap using the NMI VTREG.

NMI=0

Enter the following to return the NMI pin to a high level.

NMI=1

Note that on some devices the NMI pin must be low to enter Power Down Mode.