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CA Series PC/104
UART Register Structure for MUE250, MUE450,
and MUE850 chips
There are 512 bytes for each UART register and 0x200 offset between each port. However, there is one
exception, for the models which are 4-port boards, such as CP-104EL-A, CP-114EL, CP-114EL-I, and
CP-134EL-A, the offset of the fourth UART register is 0xE00.
Registers for 8 ports
NOTE
For a detailed UART register description, please see the "UART Datasheet" section..
UART register address = I/O base address + (port-1) * 0x200
For example, if base address is 0x200:
The first port's UART registered I/O address is 0x200 + (1-1) * 0x200 = 0x200
..................The first registered I/O address is 0x200,
The second port's UART registered I/O address is 0x200 + (2-1) * 0x200 = 0x400
NOTE
For CP-104EL-A, CP-114EL, CP-114EL-I, and CP-134EL-A only:
The first port's UART registered address: I/O base address
The second port's UART registered address: I/O base address + 1 * 0x200
The third port's UART registered address: I/O base address + 2 * 0x200
The fourth port's UART registered address :I/O base address + 7 * 0x200Type note content here.
The second registered I/O address is 0x201, .....
The first registered I/O register is 0x400,
The second registered I/O register is 0x401, .....
Smartio/Industio Programming Guide
Registers for 4 ports
5-4
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