Freescale Semiconductor MPC5553 - Watchpoint Support

MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
25-60 Freescale Semiconductor
25.11.14 Watchpoint Support
This section details the watchpoint features of the NZ6C3 module.
25.11.14.1 Overview
The NZ6C3 module provides watchpoint messaging via the auxiliary pins, as defined by the IEEE-ISTO
5001-2003 standard.
NZ6C3 is not compliant with Class4 breakpoint/watchpoint requirements defined in the standard. The
breakpoint/watchpoint control register is not implemented.
25.11.14.2 Watchpoint Messaging
Enabling watchpoint messaging is done by setting the watchpoint enable bit in the DC1 register. Setting
the individual watchpoint sources is supported through the e200z6 Nexus1 module. The e200z6 Nexus1
module is capable of setting multiple address and/or data watchpoints. Please refer to the e200z6 Core
Reference Manual for more information on watchpoint initialization.
When these watchpoints occur, a watchpoint event signal from the Nexus1 module causes a message to be
sent to the queue to be messaged out. This message includes the watchpoint number indicating which
watchpoint caused the message.
The occurrence of any of the e200z6 defined watchpoints can be programmed to assert the event out EVTO
pin for one (1) period of the output clock (MCKO).
Watchpoint information is messaged out in the following format
Figure 25-48. Watchpoint Message Format.
Table 25-38. Watchpoint Source Encoding
Watchpoint Source (8 bits) Watchpoint Description
00000001 e200z6 Watchpoint #0 (IAC1 from Nexus1)
00000010 e200z6 Watchpoint #1 (IAC2 from Nexus1)
00000100 e200z6 Watchpoint #2 (IAC3 from Nexus1)
00001000 e200z6 Watchpoint #3 (IAC4 from Nexus1)
00010000 e200z6 Watchpoint #4 (DAC1 from Nexus1)
00100000 e200z6 Watchpoint #5 (DAC2 from Nexus1)
01000000 e200z6 Watchpoint #6 (DCNT1 from Nexus1)
10000000 e200z6 Watchpoint #7 (DCNT2 from Nexus1)
WPHIT
msb lsb
12
SRC TCODE (001111)
3
6 bits4 bits4 bits
Fixed length = 14 bits