參數(shù)資料
型號: MC68HC912BL16VFU8
廠商: FREESCALE SEMICONDUCTOR INC
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封裝: QFP-64
文件頁數(shù): 25/128頁
文件大?。?/td> 3326K
代理商: MC68HC912BL16VFU8
MC68HC912BL16
120
MC68HC912BL16TS/D
0 = Not a hardware background command
1 = Hardware background command (INSTRUCTION = $90)
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 2 and the word pointed to by X is then
read or written.
INSTRUCTION — BDM Instruction Register (firmware command)
(BDM) $FF00
Bit 7
6
5
4
3
2
1
Bit 0
H/F
DATA
R/W
TTAGO
REGN
RESET:
0
Table 41 TTAGO Decoding
TTAGO Value
Instruction
00
01
GO
10
TRACE1
11
TAGGO
Table 42 REGN Decoding
REGN Value
Instruction
000
001
010
READ/WRITE NEXT
011
PC
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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