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MC68HC912BD32 Datasheet, PDF (248/292 Pages) Freescale Semiconductor, Inc – Advance Information | |||
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Freescale Semiconductor, Inc.
Development Support
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
R/W â Read/Write Flag
0 = Write
1 = Read
MC68HC912BD32 Rev 1.0
Development Support
For More Information On This Product,
Go to: www.freescale.com
14-dev
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