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Peripheral Simulation

For STMicroelectronics STM32F101R8 — GPIO Port C - 16-Bit I/O

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.

General Purpose I/O C Dialog

General Purpose I/O C

Digital I/O Ports A-D (16-Bit) VTREG
Data Type: unsigned short

The PORTx VTREGs represent the I/O pins of the simulated MCU for Port A, Port B, and so on. PORTA represents Port A, PORTB represents Port B, etc. You may read PORTx to determine the state of the output pins of that port. For example, in the command window you may type,


to obtain value corresponding to the set pins of Port A. You may also change the input values of port pins by changing the value of the VTREG. For example,


sets the upper four port pins of Port A to a value of 1 and all other port pins to a value of 0. You may use the bitwise operators AND(&), OR(|) and XOR(^) to change individual bits of the PORTx VTREGs. For example:

PORTA |=  0x00000001;  /* Set P0.0 Pin */
PORTB &= ~0x00000200;  /* Clr P1.9 Pin */
PORTA ^=  0x00800000;  /* Toggle P0.23 Pin */
Get more information about the
Peripheral Simulation Capabilities
of the µVision Debugger.
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