Peripheral Simulation

For Infineon XC888C-8FF — Port 3

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.

Parallel Port 3 Dialog

This dialog displays the SFR and pins of Port 3. This port has several alternate functions but it may be used as a 8-bit general purpose I/O port.

• P3_DATA represents the P3 SFR. The HEX value and value of each bit is displayed and may be changed from this dialog.
• P3_DIR is the port direction SFR for P3_DATA. When P3_DIR.x=0, P3_DATA.x is an input. When P3_DIR.x=1, P3_DATA.x is an output.
• P3_OD is the open drain control SFR for P3_DATA. When P3_OD.x=0, the P3_DATA.x output driver works in push/pull mode. When P3_OD.x=1, the P3_DATA.x output driver works in open drain mode.
• P3_PUDSEL selects a pull-up or pull-down device for each pin in P3_DATA. When P3_PUDSEL.x=0, P3_DATA.x is pulled down. When P3_PUDSEL.x=1, P3_DATA.x is pulled up(default).
• P3_PUDEN enables a pull-up or pull-down devices for each pin in P3_DATA. When P3_PUDEN.x=0, P3_PUDSEL.x is disabled. When P3_PUDEN.x=1, P3_PUDSEL.x is enabled.
• P3_ALTSEL0 selects the general purpose I/O, Alternate Output 1.
• P3_ALTSEL1 selects the general purpose I/O, Alternate Output 2.
• Pins represents the states of the pins on the simulated MCU. When used as outputs, these have the same value as the P3_DATA SFR. When used as inputs (P3_DIR.x is 0) you may set the level of the input pin to high (1) or low (0).

PORTx VTREG
Data Type: unsigned char

The PORTx VTREGs represent the I/O pins of the simulated MCU for Port 0, Port 1, and so on. PORT0 represents Port 0, PORT1 represents Port 1, 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,

PORT0

to obtain value corresponding to the set pins of Port 0. You may also change the input values of port pins by changing the value of the VTREG. For example,

PORT1=0xF0

sets the upper four port pins of Port 1 to a value of 1 and the lower 4 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:

PORT1 |=  0x01;  /* Set P1.0 Pin */
PORT3 &= ~0x02;  /* Clr P3.1 Pin */
PORT1 ^=  0x80;  /* Toggle P1.7 Pin */