mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 578

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 15 Background Debug Module (S12XBDMV2)
15.4
The BDM receives and executes commands from a host via a single wire serial interface. There are two
types of BDM commands: hardware and firmware commands.
Hardware commands are used to read and write target system memory locations and to enter active
background debug mode, see
includes all memory that is accessible by the CPU.
Firmware commands are used to read and write CPU resources and to exit from active background debug
mode, see
accumulator (D), X index register (X), Y index register (Y), stack pointer (SP), and program counter (PC).
Hardware commands can be executed at any time and in any mode excluding a few exceptions as
highlighted (see
“Security”). Firmware commands can only be executed when the system is not secure and is in active
background debug mode (BDM).
15.4.1
If the user resets into special single chip mode with the system secured, a secured mode BDM firmware
lookup table is brought into the map overlapping a portion of the standard BDM firmware lookup table.
The secure BDM firmware verifies that the on-chip EEPROM and Flash EEPROM are erased. This being
the case, the UNSEC and ENBDM bit will get set. The BDM program jumps to the start of the standard
BDM firmware and the secured mode BDM firmware is turned off and all BDM commands are allowed.
If the EEPROM or Flash do not verify as erased, the BDM firmware sets the ENBDM bit, without asserting
UNSEC, and the firmware enters a loop. This causes the BDM hardware commands to become enabled,
but does not enable the firmware commands. This allows the BDM hardware to be used to erase the
EEPROM and Flash.
BDM operation is not possible in any other mode than special single chip mode when the device is secured.
The device can only be unsecured via BDM serial interface in special single chip mode. For more
information regarding security, please see the S12X_9SEC Block Guide.
15.4.2
The system must be in active BDM to execute standard BDM firmware commands. BDM can be activated
only after being enabled. BDM is enabled by setting the ENBDM bit in the BDM status (BDMSTS)
register. The ENBDM bit is set by writing to the BDM status (BDMSTS) register, via the single-wire
interface, using a hardware command such as WRITE_BD_BYTE.
578
Functional Description
Section 15.4.4, “Standard BDM Firmware
Security
Enabling and Activating BDM
Section 15.4.3, “BDM Hardware
Section 15.4.3, “BDM Hardware
MC9S12XDP512 Data Sheet, Rev. 2.17
Commands”) and in secure mode (see
Commands”. The CPU resources referred to are the
Commands”. Target system memory
Freescale Semiconductor
Section 15.4.1,