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| S912XHZ512F1VAG Datasheet, PDF (750/978 Pages) Freescale Semiconductor, Inc – Covers MC9S12XHZ384, MC9S12XHZ256 | |||
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Chapter 21 Background Debug Module (S12XBDMV2)
Table 21-6. Hardware Commands (continued)
Command
Opcode
(hex)
Data
Description
WRITE_WORD
C8 16-bit address Write to memory with standard BDM ï¬rmware lookup table out of map.
16-bit data in Must be aligned access.
NOTE:
If enabled, ACK will occur when data is ready for transmission for all BDM READ commands and will occur after the write is
complete for all BDM WRITE commands.
21.4.4 Standard BDM Firmware Commands
Firmware commands are used to access and manipulate CPU resources. The system must be in active
BDM to execute standard BDM ï¬rmware commands, see Section 21.4.2, âEnabling and Activating
BDMâ. Normal instruction execution is suspended while the CPU executes the ï¬rmware located in the
standard BDM ï¬rmware lookup table. The hardware command BACKGROUND is the usual way to
activate BDM.
As the system enters active BDM, the standard BDM ï¬rmware lookup table and BDM registers become
visible in the on-chip memory map at 0x7FFF00â0x7FFFFF, and the CPU begins executing the standard
BDM ï¬rmware. The standard BDM ï¬rmware watches for serial commands and executes them as they are
received.
The ï¬rmware commands are shown in Table 21-7.
MC9S12XHZ512 Data Sheet, Rev. 1.06
750
Freescale Semiconductor
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