Name: Contec BX220 Series
Brand: Contec
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6. Appendix

BX-220 User’s manual

SERIAL I/O Address and Register Function

The following table lists the I/O addresses in case of SERIAL A.

Table 6.2. I/O Port Addresses

I/O address

DLAB

Read/Write

03F8H 0 W Transmitter holding register THR

R Receive buffer register RBR

Divisor latch register (LSB)

DLL

03F9H 1 W Divisor latch register (MSB) DLM

Interrupt enable register

IER

03FAH

Interrupt ID register

IIR

03FBH X W Line control register LCR

03FCH X W Modem control register MCR

03FDH

Line status register

LSR

03FEH

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.

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Contec BX220 Series Specifications

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