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MC68HC12 Datasheet, PDF (409/478 Pages) Motorola, Inc – The MC68HC912DT128A microcontroller unit (MCU) is a 16-bit device composed of standard on-chip peripherals including a 16-bit central processing unit | |||
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Development Support
Background Debug Mode
DATA â Data Flag - Shows that data accompanies the command.
0 = No data
1 = Data follows the command
R/W â Read/Write Flag
0 = Write
1 = Read
BKGND â Hardware request to enter active background mode
0 = Not a hardware background command
1 = Hardware background command (INSTRUCTION = $90)
W/B â Word/Byte Transfer Flag
0 = Byte transfer
1 = Word transfer
BD/U â BDM Map/User Map Flag
Indicates whether BDM registers and ROM are mapped to addresses
$FF00 to $FFFF in the standard 64-Kbyte address space. Used only
by hardware read/write commands.
0 = BDM resources not in map
1 = BDM ROM and registers in map
INSTRUCTION â BDM Instruction Register (firmware command bit explanation)
Bit 7
6
5
H/F
DATA
R/W
4
3
TTAGO
2
1
Bit 0
REGN
$FF00
The bits in the BDM instruction register have the following meanings
when a firmware command is executed.
H/F â Hardware/Firmware Flag
0 = Firmware command
1 = Hardware command
DATA â Data Flag â Shows that data accompanies the command.
0 = No data
1 = Data follows the command
MC68HC912DT128A â Rev 4.0
MOTOROLA
Development Support
Technical Data
409
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