MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
25-12
Freescale Semiconductor
25.4.3
Programmable MCKO Frequency
MCKO is an output clock to the development tools used for the timing of MSEO and MDO pin functions.
MCKO is derived from the system clock, and its frequency is determined by the value of the MCKO_DIV
field in the port configuration register (PCR) located in the NPC. Possible operating frequencies include
one-half, one-quarter, and one-eighth system clock speed.
shows the MCKO_DIV encodings. In this table, SYS_CLK represents the system clock
frequency. The default value selected if a reserved encoding is programmed is SYS_CLK/2.
25.4.4
Nexus Messaging
Most of the messages transmitted by the NDI include a SRC field. This field is used to identify which
source generated the message.
shows the values used for the SRC field by the different clients
on the MPC5553/MPC5554. These 4-bit values are specific to the MPC5553/MPC5554. The same values
are used for the client select values written to the client select control register.
Table 25-6. NDI Configuration Options
JCOMP Asserted
MCKO_EN bit of the Port
Configuration Register
FPM bit of the Port
Configuration Register
Configuration
No
X
X
Reset
Yes
0
X
Disabled
Yes
1
1
Full-Port Mode
Yes
1
0
Reduced-Port Mode
Table 25-7. MCKO_DIV Values
MCKO_DIV[2:0]
MCKO Frequency
0b000
SYSCLK – MPC5553 Only
Reserved – MPC5554 Only
0b001
SYS_CLK/2
0b010
Reserved
0b011
SYS_CLK/4
0b100
Reserved
0b101
Reserved
0b110
Reserved
0b111
SYS_CLK/8
Table 25-8. SRC Packet Encodings
SRC[3:0]
Client
0b0000
e200z6
0b0001
eDMA
0b0010
eTPU1 (ENGINE1_SRC)
Summary of Contents for MPC5553
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