32.8.10 Synchronization Busy

Name: SYNCBUSY
Offset: 0x1C
Reset: 0x00000000
Property: -

Bit 3130292827262524 
          
Access  
Reset  
Bit 2322212019181716 
          
Access  
Reset  
Bit 15141312111098 
          
Access  
Reset  
Bit 76543210 
    LENGTHRXERRCNTCTRLBENABLESWRST 
Access RRRRR 
Reset 00000 

Bit 4 – LENGTH LENGTH Synchronization Busy

Writing to the LENGTH register requires synchronization. When writing to LENGTH, SYNCBUSY.LENGTH is set until synchronization is complete. If the LENGTH register is written while SYNCBUSY.LENGTH is asserted, an APB error is generated.

ValueDescription
0LENGTH synchronization is not busy.
1LENGTH synchronization is busy.

Bit 3 – RXERRCNT Receive Error Count Synchronization Busy

The RXERRCNT register is automatically synchronized to the APB domain upon error. When returning from sleep, this bit is raised until the new value is available to be read.

ValueDescription
0RXERRCNT synchronization is not busy.
1RXERRCNT synchronization is busy.

Bit 2 – CTRLB CTRLB Synchronization Busy

Writing to the CTRLB register when the SERCOM is enabled requires synchronization. When writing to CTRLB the SYNCBUSY.CTRLB, the bit is set until synchronization is complete. If CTRLB is written while SYNCBUSY.CTRLB is asserted, an APB error is generated.

ValueDescription
0CTRLB synchronization is not busy.
1CTRLB synchronization is busy.

Bit 1 – ENABLE SERCOM Enable Synchronization Busy

Enabling and disabling the SERCOM (CTRLA.ENABLE) requires synchronization. When writing to CTRLA.ENABLE, the SYNCBUSY.ENABLE bit is set until synchronization is complete.

ValueDescription
0Enable synchronization is not busy.
1Enable synchronization is busy.

Bit 0 – SWRST Software Reset Synchronization Busy

Resetting the SERCOM (CTRLA.SWRST) requires synchronization. When writing to CTRLA.SWRST, the SYNCBUSY.SWRST bit is set until synchronization is complete.

ValueDescription
0SWRST synchronization is not busy.
1SWRST synchronization is busy.