MC912DG128A Motorola, MC912DG128A Datasheet - Page 340

• Manufacturer Part Number: MC912DG128A
• Description: Microcontrollers
• Manufacturer: Motorola

INSTRUCTION — BDM Instruction Register (firmware command bit explanation)
Development Support
MC68HC912DT128A Rev 2.0
340
Bit 7
H/F
DATA
6
H/F — Hardware/Firmware Flag
DATA — Data Flag - Shows that data accompanies the command.
R/W — Read/Write Flag
BKGND — Hardware request to enter active background mode
W/B — Word/Byte Transfer Flag
BD/U — BDM Map/User Map Flag
The bits in the BDM instruction register have the following meanings
when a firmware command is executed.
H/F — Hardware/Firmware Flag
DATA — Data Flag – Shows that data accompanies the command.
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 = Firmware command
1 = Hardware command
0 = No data
1 = Data follows the command
0 = Write
1 = Read
0 = Not a hardware background command
1 = Hardware background command (INSTRUCTION = $90)
0 = Byte transfer
1 = Word transfer
0 = BDM resources not in map
1 = BDM ROM and registers in map
0 = Firmware command
1 = Hardware command
0 = No data
R/W
5
Development Support
4
TTAGO
3
2
REGN
1
Bit 0
MOTOROLA
$FF00
14-dev