Nexus
MPC5565 Microcontroller Reference Manual, Rev. 1.0
24-16
Freescale Semiconductor
24.6.2.4
Port Configuration Register (PCR)
, is used to select the NPC mode of operation, enable MCKO and select
the MCKO frequency, and enable or disable MCKO gating. This register must be configured as soon as
the NPC is enabled.
NOTE
The mode (MCKO_GT) or clock division (MCKO_DIV) bits must not be
modified after MCKO has been enabled. Changing the mode or clock
division while MCKO is enabled can produce unpredictable results.
Reg Index: 127
Access: R/W
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
FPM
MCKO
_GT
MCKO
_EN
MCKO_DIV
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
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
PSTAT
_EN
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Figure 24-4. Port Configuration Register (PCR)
Table 24-11. PCR Field Descriptions
Field
Description
31
FPM
Full port mode. Determines if the auxiliary output port uses the full MDO port or a reduced MDO port to
transmit messages.
0 The subset of MDO[3:0] pins are used to transmit messages.
1 All MDO[11:0] pins are used to transmit messages.
Section 6.3.1.44, “Pad Configuration Register 82–75 (SIU_PCR82–SIU_PCR75)
” shows how GPIO is
enabled or disabled by the FPM setting.
30
MCKO_GT
MCKO clock gating control. Enables or disables MCKO clock gating. If clock gating is enabled, the MCKO
clock is gated when the NPC is in enabled mode but not actively transmitting messages on the auxiliary output
port. When clock gating is disabled, MCKO is allowed to run even if no auxiliary output port messages are
being transmitted.
0 MCKO gating is disabled.
1 MCKO gating is enabled.
29
MCKO_EN
MCKO enable. Enables the MCKO clock. When enabled, the frequency of MCKO is determined by the
MCKO_DIV field.
0 MCKO clock is driven to zero.
1 MCKO clock is enabled.
Summary of Contents for MPC5565
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