MMC2107 - Freescale Semiconductor

Clock Module
Freescale Semiconductor, Inc.
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Freescale Semiconductor, I
10.2 Introduction
10.8.3 PLL Lock Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .236
10.8.3.1 PLL Loss of Lock Conditions . . . . . . . . . . . . . . . . . . . . .238
10.8.3.2 PLL Loss of Lock Reset . . . . . . . . . . . . . . . . . . . . . . . . .238
10.8.4 Loss of Clock Detection . . . . . . . . . . . . . . . . . . . . . . . . . . .238
10.8.4.1 Alternate Clock Selection. . . . . . . . . . . . . . . . . . . . . . . .239
10.8.4.2 Loss-of-Clock Reset. . . . . . . . . . . . . . . . . . . . . . . . . . . .242
10.8.5 Clock Operation During Reset . . . . . . . . . . . . . . . . . . . . . .243
10.8.6 PLL Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .243
10.8.6.1 Phase and Frequency Detector (PFD). . . . . . . . . . . . . .245
10.8.6.2 Charge Pump/Loop Filter. . . . . . . . . . . . . . . . . . . . . . . .245
10.8.6.3 Voltage Control Output (VCO) . . . . . . . . . . . . . . . . . . . .246
10.8.6.4 Multiplication Factor Divider (MFD) . . . . . . . . . . . . . . . .246
10.9 Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .246
10.10 Interrupts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .246
The clock module contains:
• Crystal oscillator (OSC)
• Phase-locked loop (PLL)
• Reduced frequency divider (RFD)
• Status and control registers
• Control logic
To improve noise immunity, the PLL and OSC have their own power
supply pins, V DDSYN and V SSSYN . All other circuits are powered by the
normal internal supply pins, V DD and V SS .
10.3 Features
Features of the clock module include:
• 2- to 10-MHz reference crystal
• Support for low-power modes
• Separate clock out signal
Technical Data MMC2107 – Rev. 2.0
222 Clock Module MOTOROLA
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