MC9S12XD256MAL Datasheet, PDF (117/1348 Pages) Freescale Semiconductor, Inc – Freescale’s Scalable Controller Area Network

Chapter 2 Clocks and Reset Generator (S12CRGV6)
2.6.2 PLL Lock Interrupt
The CRG generates a PLL Lock interrupt when the LOCK condition of the PLL has changed, either from
a locked state to an unlocked state or vice versa. Lock interrupts are locally disabled by setting the
LOCKIE bit to 0. The PLL Lock interrupt flag (LOCKIF) is set to1 when the LOCK condition has
changed, and is cleared to 0 by writing a 1 to the LOCKIF bit.
2.6.3 Self Clock Mode Interrupt
The CRG generates a self clock mode interrupt when the SCM condition of the system has changed, either
entered or exited self clock mode. SCM conditions can only change if the self clock mode enable bit
(SCME) is set to 1. SCM conditions are caused by a failing clock quality check after power on reset (POR)
or low voltage reset (LVR) or recovery from full stop mode (PSTP = 0) or clock monitor failure. For details
on the clock quality check refer to Section 2.4.1.4, “Clock Quality Checker”. If the clock monitor is
enabled (CME = 1) a loss of external clock will also cause a SCM condition (SCME = 1).
SCM interrupts are locally disabled by setting the SCMIE bit to 0. The SCM interrupt flag (SCMIF) is set
to1 when the SCM condition has changed, and is cleared to 0 by writing a 1 to the SCMIF bit.
MC9S12XDP512 Data Sheet, Rev. 2.21
Freescale Semiconductor
117