Enhanced Time Processing Unit (eTPU)
MPC5566 Microcontroller Reference Manual, Rev. 2
18-46 Freescale Semiconductor
18.5 Functional Description
Refer to the eTPU Reference Manual for information regarding the functional description of the eTPU
module.
18.6 Initialization/Application Information
After initial power-on reset, the eTPU remains in an idle state (except when debug is asserted on power-on
reset—in this case, the microengines awaken in the halt state). In addition, initialize the SCM with the
eTPU application prior to configuring the eTPU.
Table 18-27. ETPU_CnHSRR Field Descriptions
Field Description
0–28 Reserved
29–31
HSR
[0:2]
Host service request. Used by the host core to request service to the channel
• HSR = 000: no host service request pending
•HSR > 000: function-dependent host service request pending.
The HSR value turns to 000 automatically at the end of microengine service for that channel. The host must write
HSR > 0 only when HSR = 0. Writing HSR = 000 withdraws a pending request if the scheduler has not started to
resolve the entry point, however after the scheduler starts resolving, do not abort the service thread.
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