MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
Freescale Semiconductor
25-43
illustrates the range that will be selected for data trace for various cases of DTSA being less
than, greater than, or equal to DTEA.
NOTE
DTSA must be less than DTEA in order to guarantee correct data write/read
traces. Data trace ranges are exclusive of the DTSA and DTEA addresses.
25.11.10 NZ6C3 Register Access via JTAG / OnCE
Access to Nexus3 register resources is enabled by loading a single instruction
(ACCESS_AUX_TAP_ONCE) into the JTAGC instruction register (IR), and then loading the
corresponding OnCE OCMD register with the NEXUS3_ACCESS instruction (refer to
). For
the NZ6C3 module, the OCMD value is 0b00_0111_1100.
After the ACCESS_AUX_TAP_ONCE instruction has been loaded, the JTAG/OnCE port allows
tool/target communications with all Nexus3 registers according to the register map in
.
Reading/writing of a NZ6C3 register then requires two (2) passes through the data-scan (DR) path of the
JTAG state machine (see
1. The first pass through the DR selects the NZ6C3 register to be accessed by providing an index (see
), and the direction (read/write). This is achieved by loading an 8-bit value into the
JTAG data register (DR). This register has the following format:
2. The second pass through the DR then shifts the data in or out of the JTAG port, lsb first.
a) During a read access, data is latched from the selected Nexus register when the JTAG state
machine passes through the capture-DR state.
b) During a write access, data is latched into the selected Nexus register when the JTAG state
machine passes through the update-DR state.
Table 25-32. Data Trace—Address Range Options
Programmed Values
Range Control Bit Value
Range Selected
DTSA < DTEA
0
DTSA -> <- DTEA
DTSA < DTEA
1
<- DTSA DTEA ->
DTSA > DTEA
N/A
Invalid range—no trace
DTSA = DTEA
N/A
Invalid range—no trace
Nexus Register Index:
Selected from values in
Read/Write (R/W):
0 Read
1 Write
Nexus Register Index
(7-bits)
(1-bit)
R/W
RESET Value: 0x00
Summary of Contents for MPC5553
Page 5: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 2 Freescale Semiconductor...
Page 21: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 xvi Freescale Semiconductor...
Page 47: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 1 26 Freescale Semiconductor...
Page 163: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 4 20 Freescale Semiconductor...
Page 179: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 5 16 Freescale Semiconductor...
Page 561: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 13 38 Freescale Semiconductor...
Page 615: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 14 54 Freescale Semiconductor...
Page 707: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 17 68 Freescale Semiconductor...
Page 755: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 18 48 Freescale Semiconductor...
Page 873: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 19 118 Freescale Semiconductor...
Page 984: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 Freescale Semiconductor 21 41...
Page 985: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 21 42 Freescale Semiconductor...
Page 1019: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 22 34 Freescale Semiconductor...
Page 1129: ...MPC5553 MPC5554 Microcontroller Reference Manual Rev 5 25 90 Freescale Semiconductor...