mc9s12xs128 Freescale Semiconductor, Inc, mc9s12xs128 Datasheet - Page 264

• Manufacturer Part Number: mc9s12xs128
• Description: Hcs12 Microcontrollers 16-bit Automotive Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

S12XE Clocks and Reset Generator (S12XECRGV1)
8.6.1
8.6.1.1
The S12XECRG generates a real time interrupt when the selected interrupt time period elapses. RTI
interrupts are locally disabled by setting the RTIE bit to zero. The real time interrupt flag (RTIF) is set to1
when a timeout occurs, and is cleared to 0 by writing a 1 to the RTIF bit.
The RTI continues to run during Pseudo Stop Mode if the PRE bit is set to 1. This feature can be used for
periodic wakeup from Pseudo Stop if the RTI interrupt is enabled.
8.6.1.2
The S12XECRG generates a IPLL Lock interrupt when the LOCK condition of the IPLL 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 zero. The IPLL 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.
8.6.1.3
The S12XECRG generates a Self Clock Mode interrupt when the SCM condition of the system has
changed, either entered or exited Self Clock Mode. 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
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 zero. 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.
264
Description of Interrupt Operation
Real Time Interrupt
IPLL Lock Interrupt
Self Clock Mode Interrupt
S12XS Family Reference Manual, Rev. 1.10
Section 8.4.1.4, “Clock Quality
Freescale Semiconductor