Contec IPC-BX/M360C, Руководство пользователя

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5. Each Component Function
User’s Manual
59
I/O Addresses and Instructions
The I/O addresses and instructions of COM1 are shown next.
Table 5.5. I/O Addresses
I/O address DLAB Read/Write Register
0 W Transmitter holding register THR
R Receive buffer register RBR
03F8H
1 W Divisor latch register (LSB) DLL
1 W Divisor latch register (MSB) DLM 03F9H
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