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MC9S12HZ256_08 Datasheet, PDF (167/692 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Chapter 5
Clocks and Reset Generator (CRGV4)
5.1 Introduction
This speciï¬cation describes the function of the clocks and reset generator (CRG).
5.1.1 Features
The main features of this block are:
⢠Phase-locked loop (PLL) frequency multiplier
â Reference divider
â Automatic bandwidth control mode for low-jitter operation
â Automatic frequency lock detector
â CPU interrupt on entry or exit from locked condition
â Self-clock mode in absence of reference clock
⢠System clock generator
â Clock quality check
â Clock switch for either oscillator- or PLL-based system clocks
â User selectable disabling of clocks during wait mode for reduced power consumption
⢠Computer operating properly (COP) watchdog timer with time-out clear window
⢠System reset generation from the following possible sources:
â Power-on reset
â Low voltage reset
Refer to the device overview section for availability of this feature.
â COP reset
â Loss of clock reset
â External pin reset
⢠Real-time interrupt (RTI)
MC9S12HZ256 Data Sheet, Rev. 2.05
Freescale Semiconductor
167
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