Microchip Technology MPLAB ICE, User Manual

Page: 122 / 192

MPLAB
®
ICE User’s Guide
DS51159B-page 122

2001 Microchip Technology Inc.
6.5.1 Viewing the Trace Memory Window
This trace buffer can be viewed by selecting Window>Trace Memory.
Figure 6.18: Trace Memory Window – MPLAB ICE
MPLAB ICE offers a trace memory window that monitors much of the
processor operation. Up to 32767 instruction cycles can be displayed. The
trace memory window contains the following information for each execution
cycle:
• Cycle Number – Cycle’s position relative to the trigger or halting point.
• Address (Addr) – Address of the instruction being fetched from
program memory.
• Opcode (Op) – Instruction being fetched.
• Label (Label) – Label (if any) associated with the program memory
address.
• Instruction (Instruction) – Disassembled instruction.
• Source Data Address (SA) – Address or symbol of the source data, if
applicable.
• Source Data Value (SD) – Value of the source data, if applicable.
• Destination Data Address (DA) – Address or symbol of the destination
data, if applicable.
• Destination Data Value (DD) – Value of the destination data, if
applicable.
• External Inputs (Ex) – Value of the external inputs.
• Time Stamp (Cycles or Seconds) – Time stamp value.
Note: Due to the timing of processor signals, the data information will be
skewed by one cycle. Destination data values are actually skewed
by two cycles, but for display purposes, the trace buffer display
compensates for one of the delayed cycles.