CHAPTER 4 PORT FUNCTIONS
Preliminary User’s Manual U16846EJ1V0UD
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4.2.3 Port 2
Port 2 is a 4-bit input-only port.
This port can also be used for A/D converter analog input.
Figure 4-10 shows a block diagram of port 2.
Figure 4-10. Block Diagram of P20 to P23
RD
A/D converter
P20/ANI0 to P23/ANI3
Internal bus
RD: Read
signal