Computer Hardware User's Guide

Serial Ports
12-16
Figure 12–11. Serial Port Block Diagram
Receive Section Transmit Section
Receive
timer (16)
Transmit
timer (16)
Bit counter
(8/16/24/32)
Bit counter
(8/16/24/32)
RSR
(32)
XSR
(32)
DRR
(32)
DXR
(32)
Load
control
Load
control
CLKR CLKX
TSTAT
CLKR
CLKX
TSTAT
Receive Clock
RINT
FSR
FSR
FSX
FSX
Load
DX
DR DR
Load
DX DX
XINT