ZL50022
Data Sheet
12.1.3.2 Automatic Reference Switching With Preferences
If a particular reference needs to have higher priority than the others, the device can be programmed in Automatic
mode with a preferred reference (RCCR Register, PMS2-0 bits = 001). When a preferred reference is selected, the
device can only switch automatically between two references, as shown in Table 8. The preferred reference will be
used as the primary reference and, by default, only its next consecutive reference will be used as the secondary
reference. No more than two references can be used in Automatic mode when a preferred reference is selected.
Primary Reference (Preferred)
Secondary Reference
Option 1
Option 2
Option 3
Option 4
Ref 0
Ref 1
Ref 2
Ref 3
Ref 1
Ref 2
Ref 3
Ref 0
Table 8 - Preferred Reference Selection Options
Figure 22 shows the state diagram for the four valid options of automatic reference switching with a preferred
reference.
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Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
