MC9S12T64 Datasheet, PDF (532/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Fast Background Debug Module (FBDM)
The BDM hardware commands are listed in Table 98.
Command
BACKGROUND
READ_BD_BYTE
READ_BD_WORD
READ_BYTE
READ_WORD
(single wire mode)
READ_WORD
(SPI mode)
WRITE_BD_BYTE
WRITE_BD_WORD
WRITE_BYTE
WRITE_WORD
Table 98 Hardware Commands
Opcode
(hex)
Data
Description
90
None
Enter background debug mode if firmware is enabled.
E4
16-bit address
16-bit data out
Read from memory with standard BDM firmware lookup table
in map. Odd address data on low byte; even address data on
high byte
EC
16-bit address Read from memory with standard BDM firmware lookup table
16-bit data out in map. Must be aligned access.
E0
16-bit address
16-bit data out
Read from memory with standard BDM firmware lookup table
out of map. Odd address data on low byte; even address data
on high byte
E8
16-bit address Read from memory with standard BDM firmware lookup table
16-bit data out out of map. Must be aligned access.
E8
16-bit address
16-bit data out
/ next address
Read from memory with standard BDM firmware lookup table
out of map. Must be aligned access. SPI interface only: next
address must be sent in with data out, use address = $FFFF
to end read word operation.
C4
16-bit address
16-bit data in
Write to memory with standard BDM firmware lookup table in
map. Odd address data on low byte; even address data on
high byte
CC
16-bit address Write to memory with standard BDM firmware lookup table in
16-bit data in map. Must be aligned access
C0
16-bit address
16-bit data in
Write to memory with standard BDM firmware lookup table out
of map. Odd address data on low byte; even address data on
high byte
C8
16-bit address Write to memory with standard BDM firmware lookup table out
16-bit data in of map. Must be aligned access.
The READ_BD and WRITE_BD commands are used for reading the on
standard BDM firmware lookup table locations and for reading and
writing to the BDM register locations. These locations are not normally
in the system memory map but share addresses with the application in
memory.
To distinguish between physical memory locations that share the same
address, BDM memory resources are enabled just for the READ_BD
and WRITE_BD access cycle. This allows the BDM system to access
MC9S12T64Revision 1.1.1
Fast Background Debug Module (FBDM)
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