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| MC9S12HY64 Datasheet, PDF (160/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers | |||
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Background Debug Module (S12SBDMV1)
⢠Single-wire communication with host development system
⢠Enhanced capability for allowing more ï¬exibility in clock rates
⢠SYNC command to determine communication rate
⢠GO_UNTIL command
⢠Hardware handshake protocol to increase the performance of the serial communication
⢠Active out of reset in special single chip mode
⢠Nine hardware commands using free cycles, if available, for minimal CPU intervention
⢠Hardware commands not requiring active BDM
⢠14 ï¬rmware commands execute from the standard BDM ï¬rmware lookup table
⢠Software control of BDM operation during wait mode
⢠When secured, hardware commands are allowed to access the register space in special single chip
mode, if the Flash erase tests fail.
⢠Family ID readable from ï¬rmware ROM at global address 0x3_FF0F (value for devices with
HCS12S core is 0xC2)
⢠BDM hardware commands are operational until system stop mode is entered
5.1.2 Modes of Operation
BDM is available in all operating modes but must be enabled before ï¬rmware commands are executed.
Some systems may have a control bit that allows suspending the function during background debug mode.
5.1.2.1 Regular Run Modes
All of these operations refer to the part in run mode and not being secured. The BDM does not provide
controls to conserve power during run mode.
⢠Normal modes
General operation of the BDM is available and operates the same in all normal modes.
⢠Special single chip mode
In special single chip mode, background operation is enabled and active out of reset. This allows
programming a system with blank memory.
5.1.2.2 Secure Mode Operation
If the device is in secure mode, the operation of the BDM is reduced to a small subset of its regular run
mode operation. Secure operation prevents access to Flash other than allowing erasure. For more
information please see Section 5.4.1, âSecurityâ.
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
160
Freescale Semiconductor
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