The Virtual PORT registers map the most frequently used regular PORT registers
into the bit-accessible I/O space.
Writing to the Virtual PORT
registers has the same effect as writing to the regular registers, but allows for
memory-specific instructions, such as bit-manipulation instructions, which are not valid
for the extended I/O memory space where the regular PORT registers
reside.Table 17-2. Virtual Port Mapping| Regular PORT Register | Mapped to Virtual PORT Register |
|---|
| PORT.DIR | VPORT.DIR |
| PORT.OUT | VPORT.OUT |
| PORT.IN | VPORT.IN |
| PORT.INTFLAG | VPORT.INTFLAG |
