Nexus
MPC5565 Microcontroller Reference Manual, Rev. 1.0
Freescale Semiconductor
24-17
24.7
NPC Functional Description
24.7.1
NPC Reset Configuration
The NPC is placed in disabled mode upon exit of reset. If message transmission via the auxiliary port is
desired, a write to the PCR is then required to enable the NPC and select the mode of operation. Asserting
MCKO_EN places the NPC in enabled mode and enables MCKO. The frequency of MCKO is selected by
writing the MCKO_DIV field. Asserting or negating the FPM bit selects full-port or reduced-port mode,
respectively.
28–26
MCKO_DIV
[2:0]
MCKO division factor. Determines the frequency of MCKO relative to the system clock frequency when
MCKO_EN is asserted. The table below shows the meaning of MCKO_DIV values. In this table, SYS_CLK
represents the system clock frequency.
25–1
Reserved.
0
PSTAT_EN
Processor status mode enable. Enables processor status (PSTAT) mode. In PSTAT mode, all auxiliary output
port MDO pins are used to transmit processor status information, and Nexus messaging is unavailable.
0 PSTAT mode disabled
1 PSTAT mode enabled
Note:
PSTAT mode is intended for factory processor debug only. The PSTAT_EN bit should be written to
disable PSTAT mode by the customer. No Nexus messages are transmitted under any circumstances
when PSTAT mode is enabled
Table 24-11. PCR Field Descriptions (continued)
Field
Description
MCKO_DIV[2:0]
MCKO Frequency
0
SYS_CLK
1
SYS_CLK / 2
2
Reserved
3
SYS_CLK / 4
4
Reserved
5
Reserved
6
Reserved
7
SYS_CLK / 8
Содержание MPC5565
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