AN2104 View Datasheet(PDF) - Freescale Semiconductor
Part Name
Description
Manufacturer
AN2104 Datasheet PDF : 20 Pages
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Application Note
Freescale Semiconductor, Inc.
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)
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.
AN2104
10
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