Freescale Semiconductor MPC5553, Reference Manual

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MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
18-42 Freescale Semiconductor
2–3 CPR
[0:1]
Channel priority. Defines the priority level for the channel. The priority level is used by the
hardware scheduler. The values for CPR[1:0] and corresponding levels are shown in the
table below.
For more information on the hardware scheduler, refer to the eTPU reference manual.
4–5 — Reserved.
6 ETPD
This bit selects which channel signal, input or output, is used in the entry point selection.
The ETPD value has to be compatible with the function chosen for the channel, selected
in the field CFS. For details about entry table and condition encoding schemes, refer to the
eTPU reference manual. The ETPD bit is only present in the MPC5553.
1 = Use PSTO for entry point selection.
0 = Use PSTI for entry point selection.
7 ETCS Entry table condition select. Determines the channel condition encoding scheme that
selects the entry point to be taken in an entry table. The ETCS value has to be compatible
with the function chosen for the channel, selected in ETPU_CnCR[CFS]. Two condition
encoding schemes are available.
1 Select alternate entry table condition encoding scheme.
0 Select standard entry table condition encoding scheme.For details about entry table and
condition encoding schemes, refer to the eTPU reference manual.
8–10 — Reserved.
11–15 CFS
[0:4] Channel function select. Defines the function to be performed by the channel. The function
assigned to the channel has to be compatible with the channel condition encoding scheme,
selected by ETPU_CnCR[ETCS]. For more information about functions, refer to the eTPU
reference manual.
16 ODIS Output disable. Enables the channel to have its output forced to the value opposite to
OPOL when the output disable input signal corresponding to the channel group that it
belongs is active.
0 Turns off the output disable feature for the channel.For more information on output
disable, refer to the eTPU reference manual.
1 Turns on the output disable feature for the channel
17 OPOL Output polarity. Determines the output signal polarity. The activation of the output disable
signal forces, when enabled by ETPU_CnCR[ODIS], the channel output signal to the
opposite of this polarity.
0 Output active low (output disable drives output to high)
1 Output active high (output disable drives output to low)
Table 18-26. ETPU_CnCR Field Descriptions (Continued)
Bits Name Description
CPR Priority
00 Disabled
01 Low
10 Middle
11 High