Chapter 8 S12 Clock, Reset and Power Management Unit (S12CPMU_UHV_V11)MC9S12ZVMB Family Reference Manual Rev. 1.3NXP Semiconductors 2358.3.2.4 S12CPMU_UHV_V11 Synthesizer Register (CPMUSYNR)The CPMUSYNR register controls the multiplication factor of the PLL and selects the VCO frequencyrange.Read: AnytimeWrite: If PROT=0 (CPMUPROT register) and PLLSEL=1 (CPMUCLKS register), then write anytime.Else write has no effect.NOTEWriting to this register clears the LOCK and UPOSC status bits.Table 8-2. CPMURFLG Field DescriptionsField Description6PORFPower on Reset Flag — PORF is set to 1 when a power on reset occurs. This flag can only be cleared by writinga 1. Writing a 0 has no effect.0 Power on reset has not occurred.1 Power on reset has occurred.5LVRFLow Voltage Reset Flag — LVRF is set to 1 when a low voltage reset occurs on the VDD, VDDF or VDDXdomain. 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.3COPRFCOP Reset Flag — COPRF is set to 1 when a COP (Computer Operating Properly) reset occurs. Refer to 8.5.5,“Computer Operating Properly Watchdog (COP) Reset and 8.3.2.12, “S12CPMU_UHV_V11 COP ControlRegister (CPMUCOP) for details.This flag can only be cleared by writing a 1. Writing a 0 has no effect.0 COP reset has not occurred.1 COP reset has occurred.1OMRFOscillator Clock Monitor Reset Flag — OMRF is set to 1 when a loss of oscillator (crystal) clock occurs. Referto8.5.3, “Oscillator Clock Monitor Reset for details.This flag can only be cleared by writing a 1. Writing a 0 hasno effect.0 Loss of oscillator clock reset has not occurred.1 Loss of oscillator clock reset has occurred.0PMRFPLL Clock Monitor Reset Flag — PMRF is set to 1 when a loss of PLL clock occurs. This flag can only becleared by writing a 1. Writing a 0 has no effect.0 Loss of PLL clock reset has not occurred.1 Loss of PLL clock reset has occurred.Module Base + 0x00047 6 5 4 3 2 1 0R VCOFRQ[1:0] SYNDIV[5:0]WReset 0 1 0 1 1 0 0 0Figure 8-7. S12CPMU_UHV_V11 Synthesizer Register (CPMUSYNR)
