Contec SPC-8520-LA, User Manual

Page: 39 / 92

4. Jumper Setting
32
SPC-8520-LA , SPC-8521-LA
I/O addresses and instructions
The table below lists I/O addresses for use as SERIAL2.
Table 4.3. I/O addresses and instructions
I/O address DLAB Read/Write Register
W Transmitter holding Register THR
0
R Receiver buffer Register RBR 02F8h
1 W Divisor latch Register (LSB) DLL
1 W Divisor latch Register (MSB) DLM
02F9h
0 W Interrupt enable Register IER
02FAh X R Interrupt ID Register IIR
02FBh X W Line control Register LCR
02FCh X W Modem Control Register MCR
02FDh X R Line status Register LSR
02FEh X R Modem Status Register MSR
02FFh X R/W Scratch Register SCR