MC68HC908JG16FA MOTOROLA [Motorola, Inc], MC68HC908JG16FA Datasheet - Page 91
MC68HC908JG16FA
Manufacturer Part Number
MC68HC908JG16FA
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908JG16FA.pdf
(324 pages)
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7.1 Contents
7.2 Introduction
MC68HC908JG16
MOTOROLA
Technical Data — MC68HC908JG16
—
Rev. 1.0
7.2
7.3
7.4
7.4.1
7.4.2
7.4.3
7.4.4
7.4.5
7.4.6
7.5
7.5.1
7.5.2
7.6
The oscillator circuit is designed for use with crystals or ceramic
resonators. The oscillator circuit generates the crystal clock signal,
OSCXCLK, and passes through a clock doubler to produce OSCDCLK.
This clock doubler clock is further divided by two before being passed on
to the system integration module (SIM) for bus clock generation.
Figure 7-1
various external components.
The MC68HC908JG16 operates from a nominal 12MHz crystal,
providing a 6MHz internal bus clock. The 12MHz clock is required for
various modules, such as the USB and SCI. The clock doubler clock,
OSCDCLK, is used as the base clock for the COP module.
Freescale Semiconductor, Inc.
For More Information On This Product,
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
Oscillator External Connections . . . . . . . . . . . . . . . . . . . . . . . . 92
I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94
Oscillator During Break Mode. . . . . . . . . . . . . . . . . . . . . . . . . . 94
Crystal Amplifier Input Pin (OSC1). . . . . . . . . . . . . . . . . . . . 93
Crystal Amplifier Output Pin (OSC1) . . . . . . . . . . . . . . . . . . 93
Oscillator Enable Signal (SIMOSCEN). . . . . . . . . . . . . . . . . 93
Crystal Output Frequency Signal (OSCXCLK). . . . . . . . . . . 93
Clock Doubler Out (OSCDCLK) . . . . . . . . . . . . . . . . . . . . . . 93
Oscillator Out (OSCOUT). . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
shows the structure of the oscillator. The oscillator requires
Go to: www.freescale.com
Oscillator (OSC)
Section 7. Oscillator (OSC)
Technical Data
91
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