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| 型號(hào)： | MC68B912B32 |
| 廠(chǎng)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(yè)數(shù)： | 120/128頁(yè) |
| 文件大小： | 748K |
| 代理商： | MC68B912B32 |
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MOTOROLA
120
MC68HC912B32
MC68HC912B32TS/D
16.2.4 BDM Registers
Seven BDM registers are mapped into the standard 64-Kbyte address space when BDM is active. The
registers can be accessed with the hardware READ_BD and WRITE_BD commands, but must not be
written during BDM operation. Most users will only be interested in the STATUS register at $FF01; other
registers are only for use by BDM firmware and logic.
The instruction register is discussed for two conditions: when a
hardware
command is executed and
when a
firmware
command is executed.
The bits in the BDM instruction register have the following meanings when a
hardware
command is
executed.
H/F — Hardware/Firmware Flag
0 = Firmware instruction
1 = Hardware instruction
DATA — Data Flag
0 = No data
1 = Data included in command
R/W — Read/Write Flag
0 = Write
1 = Read
BKGND — Hardware request to enter active background mode
0 = Not a hardware background command
1 = Hardware background command (INSTRUCTION = $90)
Table 44 BDM Firmware Commands
Command
READ_NEXT
READ_PC
READ_D
READ_X
READ_Y
READ_SP
WRITE_NEXT
WRITE_PC
WRITE_D
WRITE_X
WRITE_Y
WRITE_SP
GO
TRACE1
TAGGO
Opcode (Hex)
62
63
64
65
66
67
42
43
44
45
46
47
08
10
18
Data
Description
16-bit data out
16-bit data out
16-bit data out
16-bit data out
16-bit data out
16-bit data out
16-bit data in
16-bit data in
16-bit data in
16-bit data in
16-bit data in
16-bit data in
None
None
None
X = X + 2; Read next word pointed-to by X
Read program counter
Read D accumulator
Read X index register
Read Y index register
Read stack pointer
X = X + 2; Write next word pointed-to by X
Write program counter
Write D accumulator
Write X index register
Write Y index register
Write stack pointer
Go to user program
Execute one user instruction then return to BDM
Enable tagging and go to user program
INSTRUCTION
— BDM Instruction Register (hardware command bit explanation)
(BDM) $FF00
Bit 7
6
5
4
3
2
1
Bit 0
H/F
DATA
R/W
BKGND
W/B
BD/U
0
0
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MC68C912B32FU8 | 16-Bit Microcontroller |
| MC68B912B32FU8 | 16-Bit Microcontroller |
| MC68C912B32CFU8 | 16-Bit Microcontroller |
| MC68CK338 | Highly Integrated, Low-Power, 32-Bit Microcontroller |
| MC68EC060 | 32-Bit Microprocessors.(32位微處理器) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC68B912B32FU8 | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:16-Bit Microcontroller |
| MC68BOOL | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:8-BIT MICROPROCESSING UNIT (MPU) |
| MC68BOOP | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:8-BIT MICROPROCESSING UNIT (MPU) |
| MC68BOOS | 制造商:MOTOROLA 制造商全稱(chēng):Motorola, Inc 功能描述:8-BIT MICROPROCESSING UNIT (MPU) |
| MC68C812A4 | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:Technical Supplement MC68C812A4 3.3V Electrical Characteristics |
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