Clock, Reset, and Power Control (CRP)
MPC5510 Microcontroller Family Reference Manual, Rev. 1
Freescale Semiconductor
5-33
Preliminary
Low-voltage or crank operation is the time when the 5 V supply voltage is pulled down below the
minimum 4.5 V limit and the device is expected to be partially functional. The supply ramp is assumed to
be relatively slow. Thus, the CRP_SOCSC[LVI5HF] is used as an early interrupt warning indication that
the supply voltage is falling. Based on the LVI5HF (either polling the CRP_SOCSC[LVI5HF] status bit or
by the CRP_SOCSC[LVI5HF] interrupt request), the LVI5 is configured for an interrupt function instead
of a reset function. Low-voltage operation below 4.0 V is not supported, as the LVI5L will force a reset at
this point.