參數(shù)資料
型號(hào)： AN2104
廠商： 飛思卡爾半導(dǎo)體(中國(guó))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(yè)數(shù)： 10/20頁(yè)
文件大?。?/td> 414K
代理商： AN2104
Application Note
AN2104
10
Operating Mode and Background Debug Mode Hints
These hints will help steer the user away from the most commonly made
mistakes.
The states of the MODA and MODB pins, upon power-up,
determine how the port A and port B pins will be configured (see
Table 4
).
The BKGD pin is used for two purposes:
–
It determines, upon reset, which operating mode the part will
enter, normal or special (see
Table 4
).
–
Then it is used as the serial communication pin for the BDM.
Once the part is operating in a mode, the mode can be changed
by writing to the mode register. The limitations to this are listed in
Figure 5
.
When in normal operating mode, special modes cannot be
accessed.
Address:
$000B
Bit 7
6
5
4
3
2
1
Bit 0
Read:
SMODN
MODB
MODA
ESTR
IVIS
EBSWAI
0
EME
Write:
Reset states:
Normal expanded narrow:
1
0
1
1
0
0
0
0
Normal expanded wide:
1
1
1
1
0
0
0
0
Special expanded narrow:
0
0
1
1
1
0
0
1
Special expanded wide:
0
1
1
1
1
0
0
1
Peripheral:
0
1
0
1
1
0
0
1
Normal single-chip:
1
0
0
1
0
0
0
0
Special single-chip:
0
0
0
1
1
0
0
1
Figure 5. Mode Register (MODE)
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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