Time Processor Unit 3
MPC561/MPC563 Reference Manual, Rev. 1.2
19-18
Freescale Semiconductor
19.4.9
Channel Priority Registers (CPRx)
The channel priority registers (CPR1, CPR2) assign one of three priority levels to a channel or disable the
channel. See
Appendix D, “TPU3 ROM Functions
,” for more information.
Table 19-14. HSSR
n
Bit Descriptions
Name
Description
CH[15:0]
Encoded type of host service. The host service request field selects the type of host service request for
the time function selected on a given channel. The meaning of the host service request bits depends
on the time function specified.
A host service request field cleared to 0b00 signals the host that service is completed by the
microengine on that channel. The host can request service on a channel by writing the corresponding
host service request field to one of three non-zero states. The CPU must monitor the host service
request register until the TPU3 clears the service request to 0b00 before any parameters are changed
or a new service request is issued to the channel.
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
Field
CH 15
CH 14
CH 13
CH 12
CH 11
CH 10
CH 9
CH 8
SRESET
0000_0000_0000_0000
Addr
0x30 401C (TPU_A), 0x30 441C (TPU_B)
Figure 19-18. CPR0 — Channel Priority Register 0
MSB
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LSB
15
Field
CH 7
CH 6
CH 5
CH 4
CH 3
CH 2
CH 1
CH 0
SRESET
0000_0000_0000_0000
Addr
0x30 401E (TPU_A), 0x30 441E (TPU_B)
Figure 19-19. CPR1 — Channel Priority Register 1
Table 19-15. CPR
n
Bit Description
Name
Description
CH[15:0]
Encoded channel priority levels.
indicates the number of time slots guaranteed for each
channel priority encoding.
Table 19-16. Channel Priorities
CHx[1:0]
Service
Guaranteed Time Slots
00
Disabled
—
01
Low
1 out of 7
10
Middle
2 out of 7
11
High
4 out of 7
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