For Atmel AT91SAM7A1 — Parallel I/O Controller (32 I/O Lines)
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 I/O Controller Dialog
The PIO Dialog box allows you to configure the parallel I/O port
using checkboxes. Controls in this dialog are presented in the
PIO/Input Filter/Output/Data Group
The PIO_PSR check boxes indicate which pins are
controlled by the associated peripheral (0-unchecked) and which
pins are controlled by the PIO (1-checked). Changing the values of
these check boxes changed the values of the PIO_PER and
PIO_PDR peripheral registers.
The PIO_IFSR check boxes indicate that glitch filtering
is enabled (1-checked) for the corresponding pin. Changing these
check boxes writes to the PIO_IFER or PIO_IFDR
The PIO_OSR check boxes indicate the output status
(0-unchecked for input, 1-checked for output) of the corresponding
pin. Changing these check boxes writes to the PIO_OER or
PIO_ODR peripheral registers.
The PIO_ODSR check boxes indicate the output value for
each port pin. Changing these check boxes writes to the
PIO_SODR or PIO_CODR peripheral registers.
Pin Data Status Group
The PIO_PDSR check boxes indicate the pin data status of
the pins on the simulated MCU.
I/O Pins Group
The Pins check boxes indicate the states of the pins on
the simulated MCU. When used as outputs, these have the same value
as the PIO_ODSR check boxes. When used as inputs you may set
the level of the input pin to high (1) or low (0).
Interrupt Mask & Status Group
The PIO_IMR check boxes indicate the interrupts enabled
for each corresponding pin. Changing these check boxes writes to
the PIO_IER or PIO_IDR peripheral registers.
The PIO_ISR check boxes allow you to view the interrupt
status registers for the PIOA pins.
Data Type: unsigned long
The PORT VTREGs represent the I/O pins of the simulated MCU
Port. You may read PORT to determine the state of the output
pins. For example, in the command window you may type,
to obtain the value corresponding to the set pins of the port. 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 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 PORT VTREGs. For
PORT |= 0x00000001; /* Set P0 Pin */
PORT &= ~0x00000200; /* Clr P9 Pin */
PORT ^= 0x00800000; /* Toggle P23 Pin */