Nexus Development Interface (NDI)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
20-22
Freescale Semiconductor
Preliminary
Figure 20-13. Nexus Event-Out Generated Break Request (5510) — Part 2
20.5.9
Nexus Reset Control
The JCOMP input that is used as the primary reset signal for the NPC is also used by the NPC to generate
a single-bit reset signal for other Nexus blocks. The single bit reset signal functions much like the IEEE
1149.1-2001 defined TRST signal but has a default value of disabled (JCOMP is pulled low during reset)
The IEEE 1149.1-2001 defines TRST to be pulled up (enabled) by default.
- Using Nexus Read/Write Access,
Configure the CRP Z0VEC register
- Select DBCR0 Register.
- Set DEVT2 Bit
- Select ONcE CMD register.
- Set EX bit to exit debug mode.
Z1 Breakpoint
Reached or
entered debug
mode?
- Select DBSR
- Write to DEVT2 bit to clear it.
Z0 Enters Debug
Mode
NPC
Z0, Z1 Mult
Z0
Z1
- Select ONcE Control Register (OCR)
- Set DR bit (request debug mode right
out of reset).
Yes