AN2104 Freescale Semiconductor, AN2104 Datasheet - Page 10

• Manufacturer Part Number: AN2104
• Description: Using Background Debug Mode
• Manufacturer: Freescale Semiconductor

Application Note
Operating Mode and Background Debug Mode Hints
10
Normal expanded narrow:
Special expanded narrow:
Normal expanded wide:
Special expanded wide:
Special single-chip:
Normal single-chip:
Reset states:
Peripheral:
Address:
These hints will help steer the user away from the most commonly made
mistakes.
Read:
Write:
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Freescale Semiconductor, Inc.
For More Information On This Product,
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
The BKGD pin is used for two purposes:
– It determines, upon reset, which operating mode the part will
– 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
When in normal operating mode, special modes cannot be
accessed.
SMODN
$000B
Bit 7
1
1
0
0
0
1
0
Figure 5. Mode Register (MODE)
enter, normal or special (see
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4).
5.
MODB
6
0
1
0
1
1
0
0
MODA
5
1
1
1
1
0
0
0
ESTR
4
1
1
1
1
1
1
1
Table
IVIS
3
0
0
1
1
1
0
1
4).
EBSWAI
2
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
AN2104
EME
Bit 0
0
0
1
1
1
0
1