HCS08 datasheet(237/290 Pages) MOTOROLA

237 / 290 page

Data Sheet — MC9S08GB60/D V1.5

MOTOROLA

237

MC9S08GB/GT

Section 15 Development Support

15.1 Introduction

Development support systems in the HCS08 include the background debug controller (BDC) and the

on-chip debug module (DBG). The BDC provides a single-wire debug interface to the target MCU that

provides a convenient interface for programming the on-chip FLASH and other nonvolatile memories.

The BDC is also the primary debug interface for development and allows non-intrusive access to memory

data and traditional debug features such as CPU register modify, breakpoints, and single instruction trace

commands.

In the HCS08 Family, address and data bus signals are not available on external pins (not even in test

modes). Debug is done through commands fed into the target MCU via the single-wire background debug

interface. The debug module provides a means to selectively trigger and capture bus information so an

external development system can reconstruct what happened inside the MCU on a cycle-by-cycle basis

without having external access to the address and data signals.

The alternate BDC clock source for MC9S08GB/GT is the ICGLCLK. See the Internal Clock Generator

(ICG) Module section for more information about ICGCLK and how to select clock sources.

HCS08 데이터시트(PDF) 237 Page - Motorola, Inc