參數(shù)資料
型號: MC68B912B32
廠商: Motorola, Inc.
英文描述: 2.5V 100ppm/Degrees C, 50uA in SOT23-3 Series (Bandgap) Voltage Reference 3-SOT-23 -40 to 125
中文描述: 16位微控制器
文件頁數(shù): 121/128頁
文件大小: 748K
代理商: MC68B912B32
MC68HC912B32
MC68HC912B32TS/D
MOTOROLA
121
W/B — Word/Byte Transfer Flag
0 = Byte transfer
1 = Word transfer
BD/U — 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 resources in map
The bits in the BDM instruction register have the following meanings when a
firmware
command is ex-
ecuted.
H/F — Hardware/Firmware Flag
0 = Firmware control logic
1 = Hardware control logic
DATA — Data Flag
0 = No data
1 = Data included in command
R/W — Read/Write Flag
0 = Write
1 = Read
TTAGO — Trace, Tag, Go Field
REGN — Register/Next Field
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.
INSTRUCTION
— BDM Instruction Register (firmware command bit explanation)
(BDM) $FF00
Bit 7
6
5
4
3
2
1
Bit 0
H/F
DATA
R/W
TTAGO
REGN
Table 45 TTAGO Decoding
TTAGO Value
00
01
10
11
Instruction
GO
TRACE1
TAGGO
Table 46 REGN Decoding
REGN Value
000
001
010
011
100
101
110
111
Instruction
READ/WRITE NEXT
PC
D
X
Y
SP
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