Peripheral Simulation

For Silicon Laboratories, Inc. C8051F122 — Ports 0-7

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 0 Dialog

This dialog displays the SFR and pins of Port 0. This port may be used as a 8-bit general purpose I/O port.

• P0 represents the P0 SFR. The HEX value and value of each bit is displayed and may be changed from this dialog.
• P0MDOUT configures the output mode of each pin for this port. When P0MDOUT.x=1, P0.x is push-pull. When P0MDOUT.x=0, P0.x is open drain.
• Pins represents the states of the pins on the simulated MCU. You may set the level of the input pin to high (1) or low (0).

Parallel Port 1 Dialog

This dialog displays the SFR and pins of Port 1. This port may be used as a 8-bit general purpose I/O port.

• P1 represents the P1 SFR. The HEX value and value of each bit is displayed and may be changed from this dialog.
• P1MDIN configures the input mode of each pin for this port. When P1MDIN.x=1, P1.x is configured for digital input, and reading this port returns a logic level.  The WEAKPUD bit determines the state of the weak pull-up bit.  When P1MDIN.x=0, P1.x is configured for analog input, which disables the weak pull-up feature.
• P1MDOUT configures the output mode of each pin for this port. When P1MDOUT.x=1, P1.x is push-pull. When P1MDOUT.x=0, P1.x is open drain.
• Pins represents the states of the pins on the simulated MCU. You may set the level of the input pin to high (1) or low (0).

Parallel Port 2 Dialog

This dialog displays the SFR and pins of Port 2. This port may be used as a 8-bit general purpose I/O port.

• P2 represents the P2 SFR. The HEX value and value of each bit is displayed and may be changed from this dialog.
• P2MDOUT configures the output mode of each pin for this port. When P2MDOUT.x=1, P2.x is push-pull. When P2MDOUT.x=0, P2.x is open drain.
• Pins represents the states of the pins on the simulated MCU. You may set the level of the input pin to high (1) or low (0).

Parallel Port 3 Dialog

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

• P3 represents the P3 SFR. The HEX value and value of each bit is displayed and may be changed from this dialog.
• P3MDOUT configures the output mode of each pin for this port. When P3MDOUT.x=1, P3.x is push-pull. When P3MDOUT.x=0, P3.x is open drain.
• Pins represents the states of the pins on the simulated MCU. You may set the level of the input pin to high (1) or low (0).

Parallel Port 4 Dialog

This dialog displays the SFR and pins of Port 4. This port may be used as a 8-bit general purpose I/O port.

• P4 represents the P4 SFR. The HEX value and value of each bit is displayed and may be changed from this dialog.
• P4MDOUT configures the output mode of each pin for this port. When P4MDOUT.x=1, P4.x is push-pull. When P4MDOUT.x=0, P4.x is open drain.
• Pins represents the states of the pins on the simulated MCU. You may set the level of the input pin to high (1) or low (0).

Parallel Port 5 Dialog

This dialog displays the SFR and pins of Port 5. This port may be used as a 8-bit general purpose I/O port.

• P5 represents the P5 SFR. The HEX value and value of each bit is displayed and may be changed from this dialog.
• P5MDOUT configures the output mode of each pin for this port. When P5MDOUT.x=1, P5.x is push-pull. When P5MDOUT.x=0, P5.x is open drain.
• Pins represents the states of the pins on the simulated MCU. You may set the level of the input pin to high (1) or low (0).

Parallel Port 6 Dialog

This dialog displays the SFR and pins of Port 6. This port may be used as a 8-bit general purpose I/O port.

• P6 represents the P6 SFR. The HEX value and value of each bit is displayed and may be changed from this dialog.
• P6MDOUT configures the output mode of each pin for this port. When P6MDOUT.x=1, P6.x is push-pull. When P6MDOUT.x=0, P6.x is open drain.
• Pins represents the states of the pins on the simulated MCU. You may set the level of the input pin to high (1) or low (0).

Parallel Port 7 Dialog

This dialog displays the SFR and pins of Port 7. This port may be used as a 8-bit general purpose I/O port.

• P7 represents the P7 SFR. The HEX value and value of each bit is displayed and may be changed from this dialog.
• P7MDOUT configures the output mode of each pin for this port. When P7MDOUT.x=1, P7.x is push-pull. When P7MDOUT.x=0, P7.x is open drain.
• Pins represents the states of the pins on the simulated MCU. 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 */