Computer Hardware User Manual

302
CHAPTER 13 UART
Figure 13.4-10 Block Diagram of Serial Switch Register
UART
Internal data bus
8-bit serial I/O
SSEL bit
SSEL
register
Selector
Selector
Port 3
Pin (P30/UCK/SCK)
Pin (P32/UI/SI)
Pin (P31/UO/SO)