CM312 Datasheet, PDF (29/56 Pages) List of Unclassifed Manufacturers – Communications utilityModule

Common Register definitions
BA + 0 – Interrupt Status (Read Only)
7
6
5
4
3
2
Reserved Reserved TxRDY* RxRDY*
CN6
CN5
For each CNx bit:
0 = Not interrupting
1 = Interrupt set
TxRDY*
0 = indicates a buffer ready for at least one of the four transmit channels
1 = indicates that all transmit buffers are full
RxRDY*
0 = indicates one or more of the receive channels has data ready to read
1 = indicates that all receive buffers are empty
Reserved reads as 0
BA + 1 – Address Switch (Read Only)
7
6
5
4
3
2
Reserved Reserved Reserved Reserved
SW1-4
SW1-3
For each bit, see table above
0 = Down
1 = Up
Reserved reads as A to tag on the address register.
BA + 2 -- Enable/Disable Jumpers (Read Only)
7
6
5
4
3
2
Reserved Reserved Reserved Reserved
CN6
CN5
For each CNx bit:
Jumper installed = 0 = Port is disabled
Jumper open = 1 = Port is enabled
Reserved reads as 0
7
6
Reserved Reserved
Reserved reads as 0
5
Reserved
BA + 3—Reserved
4
3
Reserved Reserved
2
Reserved
1
CN4
1
SW1-2
1
CN4
1
Reserved
0
CN3
0
SW1-1
0
CN3
0
Reserved
BA + 4-- RS-422 RTS operation (W)
7
6
5
4
3
2
1
0
Reserved Reserved
Driver
IntSel
CN6
CN5
CN4
CN3
Enable
Driver Enable:
0 = All ports in RS-422/485 mode will have the drivers disabled
1 = All ports in RS-422/485 mode will have the drivers controlled as selected in register 4 and 5
Default to 0 to have drivers disabled during power up. User must program to a 1 to use RS-422/485 mode.
IntSel:
0 = MCR bit-3 controls the three state interrupt output.
1 = Overrides MCR bit-3 and interrupt outputs are enabled continuously.
Default to 0 to set COM ports in normal mode
For each CNx bit:
0 = use RTS to enable transmitter, default case
1 = transmitter always on
CM312 Quad Serial utilityModule
19
RTD Embedded Technologies, Inc.