mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 93
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mc68hc908jb16
Manufacturer Part Number
mc68hc908jb16
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908JB16.pdf
(332 pages)
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7.1 Contents
7.2 Introduction
MC68HC908JB16
Freescale Semiconductor
Technical Data — MC68HC908JB16
—
Rev. 1.1
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 MC68HC908JB16 operates from a nominal 12MHz crystal,
providing a 6MHz internal bus clock. The 12MHz clock is required for
various modules, such as the CGMs and USB. The clock doubler clock,
OSCDCLK, is used as the base clock for the COP module.
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Low-Power Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Oscillator During Break Mode. . . . . . . . . . . . . . . . . . . . . . . . . . 96
Oscillator External Connections . . . . . . . . . . . . . . . . . . . . . . . .94
I/O Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Crystal Amplifier Input Pin (OSC1). . . . . . . . . . . . . . . . . . . . 95
Crystal Amplifier Output Pin (OSC1) . . . . . . . . . . . . . . . . . . 95
Oscillator Enable Signal (SIMOSCEN). . . . . . . . . . . . . . . . . 95
Crystal Output Frequency Signal (OSCXCLK). . . . . . . . . . . 95
Clock Doubler Out (OSCDCLK) . . . . . . . . . . . . . . . . . . . . . . 95
Oscillator Out (OSCOUT). . . . . . . . . . . . . . . . . . . . . . . . . . . 96
Wait Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
Stop Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
shows the structure of the oscillator. The oscillator requires
Oscillator (OSC)
Section 7. Oscillator (OSC)
Technical Data
93
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