Contec BOX-PC 961D Series, User Manual

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6. Appendix
BX-961D Series User’s Manual
49
SERIAL I/O Address and Register Function
The following table lists the I/O addresses in case of SERIAL A.
Table 6.5. I/O Address
I/O address DLAB Read/Write Register
03F8H 0 W Transmitter holding register THR
R Receive buffer register RBR
1 W Divisor latch register (LSB) DLL
03F9H 1 W Divisor latch register (MSB) DLM
0 W Interrupt enable register IER
03FAH X R Interrupt ID register IIR
03FBH X W Line control register LCR
03FCH X W Modem control register MCR
03FDH X R Line status register LSR
03FEH X R Modem status register MSR
03FFH X R/W Scratch register SCR
DLAB (Divisor Latch Access Bit) : The value in bit 7 of the line control register.