CP3BT23_14 Datasheet, PDF (225/324 Pages) Texas Instruments – CP3BT23 Reprogrammable Connectivity Processor with Bluetooth and Dual CAN Interfaces

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RBF
OVR
CP3BT23
SNOSCX3A – JULY 2013 – REVISED JANUARY 2014
The Read Buffer Full bit, when set, indicates that the Microwire read buffer is full and ready
to be read by software. It is set when the shifter loads the read buffer, which occurs upon
completion of a transfer sequence if the read buffer is empty. The RBF bit is updated when
the MWDAT register is read. At that time, the RBF bit is cleared if the shifter does not contain
any new data (in other words, the shifter is not receiving data or has not yet received a full
byte of data). The RBF bit remains set if the shifter already holds new data at the time that
MWDAT is read. In that case, MWDAT is immediately reloaded with the new data and is
ready to be read by software.
0 – Microwire read buffer is not full.
1 – Microwire read buffer is full.
The Receive Overrun Error bit, when set in master mode, indicates that a receive overrun
error has occurred. This error occurs when the read buffer is full, the 8-bit shifter is full, and a
new data transfer sequence starts. This bit is undefined in slave mode. The OVR bit, once
set, remains set until cleared by software. Software clears this bit by writing a 1 to its bit
position. Writing a 0 to this bit position has no effect. No other bits in the MWSTAT register
are affected by a write operation to the register.
0 – No receive overrun error has occurred.
1 – Receive overrun error has occurred.
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Microwire/SPI Interface 225