MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
25-32 Freescale Semiconductor
Table 25-22 shows the event code encodings used for certain messages.
Table 25-23 shows the data trace size encodings used for certain messages.
25.11 NZ6C3 Memory Map/Register Definition
This section describes the NZ6C3 programmer’s model. NZ6C3 registers are accessed using the
JTAG/OnCE port in compliance with IEEE 1149.1. See Section 25.11.10, “ NZ6C3 Register Access
via JTAG / OnCE” for details on NZ6C3 register access.
NOTE
NZ6C3 registers and output signals are numbered using bit 0 as the least
significant bit. This bit ordering is consistent with the ordering defined by
the IEEE-ISTO 5001 standard.
Table 25-24 details the register map for the NZ6C3 module.
Table 25-21. RCODE values (TCODE = 27)
Resource Code
(RCODE)
Description
0001 Program trace, branch / predicate instruction history. This type of packet is
terminated by a stop bit set to 1 after the last history bit.
Table 25-22. Event Code Encoding (TCODE = 33)
Event Code
(EVCODE)
Description
0000 Entry into debug mode
0001 Entry into low power mode (CPU only)
1
1
The device enters Low Power Mode when the Nexus stall
mode is enabled (NZ6C3_DC1[OVC]=0b011) and a
trace message is in danger of over-flowing the Nexus
queue.
0100 Disabling Program Trace
0101–1111 Reserved for future functionality
Table 25-23. Data Trace Size Encodings (TCODE = 5, 6, 13, 14)
DTM Size Encoding Transfer Size
000 Byte
001 Half-word (2 bytes)
010 Word (4 bytes)
011 Double-word (8 bytes)
100 String (3 bytes)
101–111 Reserved
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