For Infineon XC874-13F — Port 4
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 4 Dialog
This dialog displays the SFR and pins of Port 4. This port has
several alternate functions but it may be used as a 8-bit general
purpose I/O port.
P4_DATA represents the P4 SFR. The HEX value and value
of each bit is displayed and may be changed from this dialog.
P4_DIR is the port direction SFR for P4_DATA. When
P4_DIR.x=0, P4_DATA.x is an input. When P4_DIR.x=1, P4_DATA.x is an
P4_OD is the open drain control SFR for P4_DATA. When
P4_OD.x=0, the P4_DATA.x output driver works in push/pull mode.
When P4_OD.x=1, the P4_DATA.x output driver works in open drain
P4_PUDSEL selects a pull-up or pull-down device for each
pin in P4_DATA. When P4_PUDSEL.x=0, P4_DATA.x is pulled down. When
P4_PUDSEL.x=1, P4_DATA.x is pulled up(default).
P4_PUDEN enables a pull-up or pull-down devices for each
pin in P4_DATA. When P4_PUDEN.x=0, P4_PUDSEL.x is disabled. When
P4_PUDEN.x=1, P4_PUDSEL.x is enabled.
P4_ALTSEL0 selects the general purpose I/O, Alternate
P4_ALTSEL1 selects the general purpose I/O, Alternate
Pins represents the states of the pins on the simulated
MCU. When used as outputs, these have the same value as the P4_DATA
SFR. When used as inputs (P4_DIR.x is 0) you may set the level of
the input pin to high (1) or low (0).
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,
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,
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 */