14.3.1.6 Enable Write-Synchronization

Writing to the Enable bit in the Control register (CTRL.ENABLE) will also trigger write-synchronization and set STATUS.SYNCBUSY. CTRL.ENABLE will read its new value immediately after being written. The Synchronisation Ready interrupt (if available) cannot be used for Enable write-synchronization.

When the enable write-synchronization is ongoing (STATUS.SYNCBUSY is one), attempt to do any of the following will cause the peripheral bus to stall until the enable synchronization is complete:

• Writing a peripheral core register
• Writing an APB register
• Reading a read-synchronized peripheral core register

APB registers can be read while the enable write-synchronization is ongoing without causing the peripheral bus to stall.