CM312 datasheet(29/56 Pages) ETC

29 / 56 page

CM312 Quad Serial utilityModule

RTD Embedded Technologies, Inc.

Common Register definitions

BA + 0 – Interrupt Status (Read Only)

Reserved

TxRDY*

RxRDY*

CN6

CN5

CN4

CN3

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)

Reserved

SW1-4

SW1-3

SW1-2

SW1-1

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)

Reserved

CN6

CN5

CN4

CN3

For each CNx bit:

Jumper installed = 0 = Port is disabled

Jumper open = 1 = Port is enabled

Reserved reads as 0

BA + 3—Reserved

Reserved

Reserved reads as 0

BA + 4-- RS-422 RTS operation (W)

Reserved

Driver

Enable

IntSel

CN6

CN5

CN4

CN3

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

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