MC9S12HY64 Datasheet, PDF (162/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Background Debug Module (S12SBDMV1)
5.2 External Signal Description
A single-wire interface pin called the background debug interface (BKGD) pin is used to communicate
with the BDM system. During reset, this pin is a mode select input which selects between normal and
special modes of operation. After reset, this pin becomes the dedicated serial interface pin for the
background debug mode.
5.3 Memory Map and Register Definition
5.3.1 Module Memory Map
Table 5-1 shows the BDM memory map when BDM is active.
Table 5-1. BDM Memory Map
Global Address
0x3_FF00–0x3_FF0B
0x3_FF0C–0x3_FF0E
0x3_FF0F
0x3_FF10–0x3_FFFF
Module
BDM registers
BDM firmware ROM
Family ID (part of BDM firmware ROM)
BDM firmware ROM
Size
(Bytes)
12
3
1
240
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
162
Freescale Semiconductor