MC9S12HY64 Datasheet, PDF (170/792 Pages) Freescale Semiconductor, Inc – S12 Microcontrollers

Background Debug Module (S12SBDMV1)
Table 5-5. Firmware Commands
Command¹
Opcode
(hex)
Data
Description
READ_NEXT²
62 16-bit data out Increment X index register by 2 (X = X + 2), then read word X points to.
READ_PC
63 16-bit data out Read program counter.
READ_D
64 16-bit data out Read D accumulator.
READ_X
65 16-bit data out Read X index register.
READ_Y
66 16-bit data out Read Y index register.
READ_SP
67 16-bit data out Read stack pointer.
WRITE_NEXT
42 16-bit data in Increment X index register by 2 (X = X + 2), then write word to location
pointed to by X.
WRITE_PC
43 16-bit data in Write program counter.
WRITE_D
44 16-bit data in Write D accumulator.
WRITE_X
45 16-bit data in Write X index register.
WRITE_Y
46 16-bit data in Write Y index register.
WRITE_SP
47 16-bit data in Write stack pointer.
GO
GO_UNTIL³
08
none
Go to user program. If enabled, ACK will occur when leaving active
background mode.
0C
none
Go to user program. If enabled, ACK will occur upon returning to active
background mode.
TRACE1
10
none
Execute one user instruction then return to active BDM. If enabled,
ACK will occur upon returning to active background mode.
TAGGO -> GO
18
none
(Previous enable tagging and go to user program.)
This command will be deprecated and should not be used anymore.
Opcode will be executed as a GO command.
1 _{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.
2 _{When the firmware command READ_NEXT or WRITE_NEXT is used to access the BDM address space the BDM resources}
are accessed rather than user code. Writing BDM firmware is not possible.
3 _{System stop disables the ACK function and ignored commands will not have an ACK-pulse (e.g., CPU in stop or wait mode).}
The GO_UNTIL command will not get an Acknowledge if CPU executes the wait or stop instruction before the “UNTIL”
condition (BDM active again) is reached (see Section 5.4.7, “Serial Interface Hardware Handshake Protocol” last note).
MC9S12HY/HA-Family Reference Manual, Rev. 1.04
170
Freescale Semiconductor