MC9S08AW60 Datasheet, PDF (257/320 Pages) Freescale Semiconductor, Inc – Microcontrollers

Chapter 15
Development Support
15.1 Introduction
This chapter describes the single-wire background debug mode (BDM), which uses the on-chip
background debug controller (BDC) module, and the independent on-chip real-time in-circuit emulation
(ICE) system, which uses the on-chip debug (DBG) module.
15.1.1 Features
Features of the BDC module include:
• Single pin for mode selection and background communications
• BDC registers are not located in the memory map
• SYNC command to determine target communications rate
• Non-intrusive commands for memory access
• Active background mode commands for CPU register access
• GO and TRACE1 commands
• BACKGROUND command can wake CPU from stop or wait modes
• One hardware address breakpoint built into BDC
• Oscillator runs in stop mode, if BDC enabled
• COP watchdog disabled while in active background mode
Features of the ICE system include:
• Two trigger comparators: Two address + read/write (R/W) or one full address + data + R/W
• Flexible 8-word by 16-bit FIFO (first-in, first-out) buffer for capture information:
— Change-of-flow addresses or
— Event-only data
• Two types of breakpoints:
— Tag breakpoints for instruction opcodes
— Force breakpoints for any address access
• Nine trigger modes:
— Basic: A-only, A OR B
— Sequence: A then B
— Full: A AND B data, A AND NOT B data
— Event (store data): Event-only B, A then event-only B
— Range: Inside range (A ≤ address ≤ B), outside range (address < A or address > B)
MC9S08AW60 Data Sheet, Rev.1.0
Freescale Semiconductor
257