The LP5814I has individual engine busy flag for each output channel, OUT0_ENGINE_BUSY, OUT1_ENGINE_BUSY, OUT2_ENGINE_BUSY and OUT3_ENGINE_BUSY, to indicate whether the engine selected by the output channel is under running or not. Besides the individule output busy flag there is a global engine busy flag, ENGINE_BUSY, to indicate if there is engine under running or not.

When the ENGINE_BUSY is set as 1, the engine configure registers and pattern configure registers shown in Table 7-4 are locked for modification protection. These engine busy lock registers can only be modified when ENGINE_BUSY = 0.

The LP5814I has 4 internal engine busy flags, ENGINE0_BUSY, ENGINE1_BUSY, ENGINE2_BUSY and ENGINE3_BUSY, as shown in Figure 7-7. The ENGINEy_BUSY is set as 1 after Start_command is received with all the below conditions.

• The engine has been selected by at least one channel, for example OUTx, and there is at least one engine order enabled in this engine
• The autonomous enable bit is set as 1 of the OUTx

The internal ENGINEy_BUSY flag keeps as 1 until the engine has completed or there is Stop_command received.

Figure 7-7 Internal Engine Busy Status

Any one of the internal engine busy flag, ENGINEx_BUSY, set to 1 leads to the global engine busy flag, ENGINE_BUSY, being 1, as shown in Figure 7-8.

The individual engine busy flag, OUTx_ENGINE_BUSY, is dependent on the internal engine busy flag selected by the correpsonding engine channel register value.

Figure 7-8 Individual and Global Engine Busy Flag