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| DS80C320-MCG Datasheet, PDF (164/175 Pages) Dallas Semiconductor – High-Speed Microcontroller User Guide | |||
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High-Speed Microcontroller Userâs Guide
The registers shown in Table 15-2 are battery-backed, and one or more bits will be indeterminate
following a no-battery reset. They should be initialized as part of a no-battery reset procedure.
BATTERY BACKED SFRS Table 15-2
REGISTER NAME
LOCATION
TRIM
96h
RTASS
F2h
RTAS
F3h
RTAM
F4h
RTAH
F5h
RTCC
F9h
RTCSS
FAh
RTCS
FBh
RTCM
FCh
RTCH
FDh
RTCD0
FEh
RTCD1
FFh
LITHIUM BATTERY CONSIDERATIONS
Lithium primary (non-rechargeable) batteries can fail and/or rupture if subjected to reverse current from
the device they are powering. The battery-switching circuitry inside the DS87C530 was designed to
reduce or eliminate the need for external hardware required to meet battery safety regulations. As shown
in the DS87C530 Data Sheet, a current limiting resistor is always in series with a switching field-effect
transistor, regardless of whether the DS87C530 is drawing current from VCC or VBAT pins. This satisfies
the two mechanism requirement of most safety codes.
164 of 175
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