The document discusses setting up the PI/T registers for input/output and interfacing. It explains that PI/T registers need to be declared for correct memory mapping and act as the input/output system while MP processes. The document also provides an example function that sets PORTA as input and PORTB as output on the PI/T, and describes using PI/T to turn on a motor by generating a signal.

1. The truth behind coding
To declare the PI/T
registers to the
correct memory
mapping
In Chapter 11
• All of these are the internal
registers for Pi/T
• Why PI/T?
Work as input output system
whereas MP is only the brain
to process

2. Set PI/T PORTA as input
Set PI/T PORTB as output
Why need to write this function!??
1)To set the PI/T PORTS either as input or output
2)To set the mode of the PI/T when interfacing

3. $80
To PI/T
Switch ON Then CPU
PADR = 1 or HIGH
Then CPU
Process
Generates signal
$80
$80 to turn on Motor