National CP3BT26 User Manual

129

www.national.com

0

0

0

0

RX_NOT_ACTIVE

0

0

0

1

Reserved for RX_BUSY. (This condition indicates that soft-
ware wrote RX_NOT_ACTIVE to a buffer when the data 
copy process is still active.)

0

0

1

0

RX_READY

0

0

1

1

RX_BUSY0 (Indicates data is being copied for the first time 
RX_READY 

→

  RX_BUSY0.)

0

1

0

0

RX_FULL

0

1

0

1

RX_BUSY1 (Indicates data is being copied for the second 
time RX_FULL 

→

  RX_BUSY1.)

0

1

1

0

RX_OVERRUN

0

1

1

1

RX_BUSY2 (Indicates data is being copied for the third or 
subsequent times RX_OVERRUN 

→

  RX_BUSY2.)

1

0

0

0

TX_NOT_ACTIVE

1

0

0

1

Reserved for TX_BUSY. (This state indicates that software 
wrote TX_NOT_ACTIVE to a transmit buffer which is sched-
uled for transmission or is currently transmitting.)

1

1

0

0

TX_ONCE

1

1

0

1

TX_BUSY0 (Indicates that a buffer is scheduled for trans-
mission or is actively transmitting; it can be due to one of 
two cases: a message is pending for transmission or is cur-
rently transmitting, or an automated answer is pending for 
transmission or is currently transmitting.)

1

0

1

0

TX_RTR (Automatic response to a remote frame.)

1

0

1

1

Reserved for TX_BUSY1. (This condition does not occur.)

1

1

1

0

TX_ONCE_RTR (Changes to TX_RTR after transmission.)

1

1

1

1

TX_BUSY2 (Indicates that a buffer is scheduled for trans-
mission or is actively transmitting; it can be due to one of 
two cases: a message is pending for transmission or is cur-
rently transmitting, or an automated answer is pending for 
transmission or is currently transmitting.)