PCI Express Boards
Programming Guide
6-3
UART Register Structure for MU860 chip
NOTE
For detailed UART register description, please see UART Datasheet section.
UART register address = I/O base a (port-1) *8
For example, if the base address is 0x180:
The first port’s UART register’s I/O address is 0x180+(1-1)*8 = 0x180
The first register’s I/O address is 0x180,
The second register’s I/O address is 0x181, …..
The second port’s UART register’s I/O address is 0x180+(2-1)*8 = 0x188
The first register’s I/O register is 0x188,
The second register’s I/O register is 0x189, …..
IRQ Vector Register Structure
Bit Value Status
0
Interrupt pending. Please read the UART register to get the
detail interrupt information *.
1
No interrupt pending.
All serial ports on the same Moxa board use the same IRQ. Check Vector to know which port issues the
interruption. Besides, you can also get the information by querying the IIR of each port
.
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