void enableIObus( void );
Description
- This function enables external I/O bus operation on the Rabbit 3000 or Rabbit 4000. The external
I/O bus must be enabled during any external I/O bus operation and disabled during normal
bus operations with other devices.
- Parallel port A becomes the I/O data bus and parallel port B bits 7:2 becomes the I/O address
bus.
- This function is non-reentrant.
- Port A and B data shadow register values are NOT saved or restored in this function call.
- If the macro
PORTA_AUX_IO has been previously defined, this function should not be called.
Library
- ExternIO.LIB (was in R3000.LIB prior to DC 10)
See Also
- disableIObus
