MC68HC912B32MFU8 MOTOROLA [Motorola, Inc], MC68HC912B32MFU8 Datasheet - Page 121

• Manufacturer Part Number: MC68HC912B32MFU8
• Description: 16-Bit Microcontroller
• Manufacturer: MOTOROLA [Motorola, Inc]

W/B — Word/Byte Transfer Flag
BD/U — BDM Map/User Map Flag
INSTRUCTION — BDM Instruction Register (firmware command bit explanation)
H/F — Hardware/Firmware Flag
DATA — Data Flag
R/W — Read/Write Flag
TTAGO — Trace, Tag, Go Field
REGN — Register/Next Field
MC68HC912B32
MC68HC912B32TS/D
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.
The bits in the BDM instruction register have the following meanings when a firmware command is ex-
ecuted.
Indicates which register is being affected by a command. In the case of a READ_NEXT or
WRITE_NEXT command, index register X is pre-incremented by two and the word pointed to by X is
then read or written.
0 = Byte transfer
1 = Word transfer
0 = BDM resources not in map
1 = BDM resources in map
0 = Firmware control logic
1 = Hardware control logic
0 = No data
1 = Data included in command
0 = Write
1 = Read
Bit 7
H/F
DATA
6
R/W
REGN Value
5
TTAGO Value
Table 45 TTAGO Decoding
Table 46 REGN Decoding
000
001
010
011
100
101
110
111
00
01
10
11
4
TTAGO
READ/WRITE NEXT
Instruction
Instruction
3
TRACE1
TAGGO
PC
SP
—
—
D
X
Y
GO
—
2
REGN
1
Bit 0
(BDM) $FF00
MOTOROLA
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