Computer Hardware User's Guide

Serial Ports
12-17 Peripherals
Figure 12–12. Memory-Mapped Locations for the Serial Ports
Serial-port 0 global control
Serial port 0 FSR/DR/CLKR control
§
Serial port 0 R/X timer control
¶
Serial port 0 R/X timer counter
#
Serial port 0 R/X timer period
Serial port 0 data transmit
808040h
808042h
808043h
808044h
808045h
808046h
808048h
80804Ch Serial port 0 data receive
Serial port 0 FSX/DX/CLKX control
‡
Serial-port 1 global control
Serial port 1 FSX/DX/CLKX control
‡
Serial port 1 FSR/DR/CLKR control
§
Serial port 1 R/X timer control
¶
Serial port 1 R/X timer counter
#
Serial port 1 R/X timer period
Serial port 1 data transmit
Serial port 1 data receive
808050h
808052h
808053h
808054h
808055h
808056h
808058h
80805Ch
Note: Serial port1 locations are reserved on the ’C31 and ’C32.
†
See Figure 12–13.
‡
See Figure 12–14.
§
See Figure 12–15.
¶
See Figure 12–16.
#
See Figure 12–17.
||
See Figure 12–18.
See Figure 12–19.
See Figure 12–20.
12.2.1 Serial-Port Global-Control Register
The serial-port global-control register is a 32-bit register that contains the global-
control bits for the serial port. The register is shown in Figure 12–13. Table 12–2
shows the register bits, bit names, and bit functions.