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參數(shù)資料
| 型號(hào)： | AN2104 |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | Using Background Debug Mode for the M68HC12 Family |
| 中文描述： | 使用的M68HC12家庭背景調(diào)試模式 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大小： | 414K |
| 代理商： | AN2104 |
Application Note
Theory of Operation
AN2104
5
To execute firmware commands, the user must have the BDM enabled
and active. See
Table 2
. When the BDM is active, it has control of the
CPU, which executes code out of the BDM ROM.
Table 2. BDM Firmware Commands
Command
Opcode (Hex)
Data
Description
READ_NEXT
62
16-bit data out
X = X + 2; Read next word
pointed to by X
READ_PC
63
16-bit data out
Read program counter
READ_D
64
16-bit data out
Read D accumulator
READ_X
65
16-bit data out
Read X index register
READ_Y
66
16-bit data out
Read Y index register
READ_SP
67
16-bit data out
Read stack pointer
WRITE_NEXT
42
16-bit data in
X = X + 2; Write next word
pointed to by X
WRITE_PC
43
16-bit data in
Write program counter
WRITE_D
44
16-bit data in
Write D accumulator
WRITE_X
45
16-bit data in
Write X index register
WRITE_Y
46
16-bit data in
Write Y index register
WRITE_SP
47
16-bit data in
Write stack pointer
GO
08
None
Go to user program
TRACE1
10
None
Execute one user instruction
then return to BDM
TAGGO
18
None
Enable tagging and go to
user program
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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