Freescale Semiconductor MPC5565, Reference Manual

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Enhanced Time Processing Unit (eTPU)
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor 17-43
17.4.6.4 eTPU Channel n Host Service Request Register (ETPU_C n HSRR)
ETPU_C n HSRR is used by the device core to issue service requests to the channel.
17.5 Functional Description
Refer to the eTPU Reference Manual for information regarding the functional description of the eTPU
module.
17.6 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 microengine awakens in the halt state). In addition, initialize the SCM with the
eTPU application prior to configuring the eTPU.
Address: Channel_Registe 0x0008 Access: R/W
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
R 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
R 0 0 0 0 0 0 0 0 0 0 0 0 0
HSR
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Figure 17-24. eTPU Channel n Host Service Request Register (ETPU_CnHSRR)
Table 17-27. ETPU_C n HSRR 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.