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PC912XDP512J1MAGR Datasheet(PDF) 87 Page - Freescale Semiconductor, Inc |
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PC912XDP512J1MAGR Datasheet(HTML) 87 Page - Freescale Semiconductor, Inc |
87 / 1350 page Chapter 2 Clocks and Reset Generator (S12CRGV6) MC9S12XDP512 Data Sheet, Rev. 2.17 Freescale Semiconductor 87 5 LVRF Low Voltage Reset Flag — If low voltage reset feature is not available (see device specification) LVRF always reads 0. LVRF is set to 1 when a low voltage reset occurs. This flag can only be cleared by writing a 1. Writing a 0 has no effect. 0 Low voltage reset has not occurred. 1 Low voltage reset has occurred. 4 LOCKIF PLL Lock Interrupt Flag — LOCKIF is set to 1 when LOCK status bit changes. This flag can only be cleared by writing a 1. Writing a 0 has no effect.If enabled (LOCKIE = 1), LOCKIF causes an interrupt request. 0 No change in LOCK bit. 1 LOCK bit has changed. 3 LOCK Lock Status Bit — LOCK reflects the current state of PLL lock condition. This bit is cleared in self clock mode. Writes have no effect. 0 PLL VCO is not within the desired tolerance of the target frequency. 1 PLL VCO is within the desired tolerance of the target frequency. 2 TRACK Track Status Bit — TRACK reflects the current state of PLL track condition. This bit is cleared in self clock mode. Writes have no effect. 0 Acquisition mode status. 1Tracking mode status. 1 SCMIF Self Clock Mode Interrupt Flag — SCMIF is set to 1 when SCM status bit changes. This flag can only be cleared by writing a 1. Writing a 0 has no effect. If enabled (SCMIE = 1), SCMIF causes an interrupt request. 0 No change in SCM bit. 1 SCM bit has changed. 0 SCM Self Clock Mode Status Bit — SCM reflects the current clocking mode. Writes have no effect. 0 MCU is operating normally with OSCCLK available. 1 MCU is operating in self clock mode with OSCCLK in an unknown state. All clocks are derived from PLLCLK running at its minimum frequency fSCM. Table 2-2. CRGFLG Field Descriptions (continued) Field Description |
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