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MC908QT2ACDWE Datasheet(PDF) 93 Page - Freescale Semiconductor, Inc

No. de Pieza. MC908QT2ACDWE
Descripción  M68HC08 Microcontrollers
Descarga  200 Pages
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Fabricante  FREESCALE [Freescale Semiconductor, Inc]
Página de inicio  http://www.freescale.com
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MC908QT2ACDWE Datasheet(HTML) 93 Page - Freescale Semiconductor, Inc

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MC68HC908QYA/QTA Family Data Sheet, Rev. 3
Freescale Semiconductor
93
Chapter 11
Oscillator (OSC) Module
11.1 Introduction
The oscillator (OSC) module is used to provide a stable clock source for the MCU system and bus.
The OSC shares its pins with general-purpose input/output (I/O) port pins. See Figure 11-1 for port
location of these shared pins. The OSC2EN bit is located in the port A pull enable register (PTAPUEN)
on this MCU. See Chapter 12 Input/Output Ports (PORTS) for information on PTAPUEN register.
11.2 Features
The bus clock frequency is one fourth of any of these clock source options:
1.
Internal oscillator: An internally generated, fixed frequency clock, trimmable to
± 0.4%. There are
three choices for the internal oscillator,12.8 MHz, 8 MHz, or 4 MHz. The 12.8-MHz internal
oscillator is the default option out of reset.
2.
External oscillator: An external clock that can be driven directly into OSC1.
3.
External RC: A built-in oscillator module (RC oscillator) that requires an external R connection only.
The capacitor is internal to the chip.
4.
External crystal: A built-in XTAL oscillator that requires an external crystal or ceramic-resonator.
There are three crystal frequency ranges supported, 8–32 MHz, 1–8 MHz, and 32–100 kHz.
11.3 Functional Description
The oscillator contains these major subsystems:
Internal oscillator circuit
Internal or external clock switch control
External clock circuit
External crystal circuit
External RC clock circuit


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