Peripheral Simulation

For Infineon C161CS — Clock Managment with AUX Oscillator, PLL, and Slow Down Divider

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.

Clock Generation Dialog

The Clock Generation dialog displays and allows you to specify the configuration for the MCU clock.

• CLKCFG specifies the configuration of the clock in relation to the oscillator frequency.
• CLKCON specifies whether or not the slow-down divider is used.
• CLKREL specifies the reload counter value if the slow-down divider is used.
• SCS specifies whether to use the main oscillator (when cleared) or the auxiliary oscillator (when checked).
• XTAL Main Freq. specifies the main oscillator frequency in Hz.
• XTAL Aux Freq. specifies the auxiliary oscillator frequency in Hz.

CLOCK VTREG
Data Type: unsigned long

The CLOCK VTREG contains the speed of the microcontroller instruction clock (in Hertz). This is effectively the number of 1-cycle instructions that the simulated microcontroller can execute each second. This number is derived by dividing the oscillator frequency (specified by the XTAL VTREG) by a fixed number (12 on standard 8051 devices). The CLOCK VTREG can only be read. It cannot be changed directly. It can only be changed by changing the value of the XTAL VTREG or by changing the clock divisor via the CLKCFG VTREG.

XTAL VTREG
Data Type: unsigned long

The XTAL VTREG contains the frequency of the oscillator (in Hertz) used to drive the microcontroller. The value is automatically set from the value specified in Project Options - Options for Target. However, you may change the value of XTAL using the command window. For example:

XTAL=25000000

You may also output the current value of XTAL using the following:

XTAL

XTAL may be used in calculations to synchronize external scripts with the simulated microcontroller.

XTAL_AUX VTREG
Data Type: unsigned long

The XTAL_AUX VTREG contains the frequency of the auxiliary oscillator (in Hertz) used to drive the microcontroller. You may change the value of XTAL_AUX using the command window. For example:

XTAL_AUX=32000

You may also output the current value of XTAL_AUX using the following:

XTAL_AUX

XTAL_AUX may be used in calculations to synchronize external scripts with the simulated microcontroller.