MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
25-81
25.14.2.11.1 NXDM JTAG ID Register
This JTAG ID register that is included in the NXDM module provides key development attributes to the
development tool concerning the NXDM block. The register is accessed through the standard JTAG IR/DR
paths. See
Chapter 23, “Voltage Regulator Controller (VRC) and POR Module
.”
25.14.2.11.2 Enabling the NXDM TAP Controller
Assertion of a power-on-reset signal or assertion of the JCOMP pin resets all TAP controllers on the
MPC5553/MPC5554 device. Upon exit from the test-logic-reset state, the IR value is loaded with the
JTAG ID. When the NXDM TAP is accessed, this information will help the development tool obtain
information about the Nexus module it is accessing, such as version, sequence, feature set, etc.
25.14.2.11.3 NXDM Register Access via JTAG
Access to Nexus register resources is enabled by loading a single instruction (NEXUS_ACCESS) into the
JTAG Instruction Register (IR). This IR is part of the IEEE
1149.1
TAP controller within the NXDM
Section 24.4.4, “JTAGC Instructions
After the JTAG NEXUS_ACCESS instruction has been loaded, the JTAG port allows tool/target
communications with all Nexus registers according to the map in
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
PRN
DC
PIN
W
Reset
0
0
0
0
0
1
1
1
1
1
0
0
0
1
1
0
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
PIN
MIC
1
W
Reset
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
1
Figure 25-62. NXDM JTAG ID Register
Table 25-53. NXDM JTAG ID Field Descriptions
Bit
Name
Description
31–28
PRN
1
1
The revision number is initially 0 and could change in the future.
Embedded part revision number (0x0)
27–22
DC
Freescale design center ID number (0x1F)
21–12
PIN
NXDM module part identification number, defines the features set. (0x60)
11–1
MIC
Manufacturer identity code
0x00E Freescale
0
—
Fixed per JTAG 1149.1
1 Always set
Summary of Contents for MPC5553
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