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CP3BT13 Datasheet(PDF) 95 Page - National Semiconductor (TI) |
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CP3BT13 Datasheet(HTML) 95 Page - National Semiconductor (TI) |
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95 / 232 page  95 www.national.com Table 42 Buffer Status Section of the CNSTAT Register ST3 (DIR) ST2 ST1 ST0 (BUSY) Buffer Status 00 0 0 RX_NOT_ACTIVE 00 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.) 00 1 0 RX_READY 00 1 1 RX_BUSY0 (Indicates data is being copied for the first time RX_READY → RX_BUSY0.) 0 1 0 0 RX_FULL 01 0 1 RX_BUSY1 (Indicates data is being copied for the second time RX_FULL → RX_BUSY1.) 0 1 1 0 RX_OVERRUN 01 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 10 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.) 11 0 0 TX_ONCE 11 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.) 11 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.) |
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