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參數(shù)資料
| 型號： | MC68CK338 |
| 廠商： | Motorola, Inc. |
| 元件分類： | 32位微控制器 |
| 英文描述： | Highly Integrated, Low-Power, 32-Bit Microcontroller |
| 中文描述： | 高度集成，低功耗，32位微控制器 |
| 文件頁數(shù)： | 16/133頁 |
| 文件大小： | 798K |
| 代理商： | MC68CK338 |
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MOTOROLA
16
MC68CK338
MC68CK338TS/D
3.3 System Clock
The system clock in the SIML provides timing signals for the IMB modules and for an external peripheral
bus. Because the MCU is a fully static design, register and memory contents are not affected when the
clock rate changes. System hardware and software support changes in clock rate during operation.
The system clock signal can be generated in one of two ways. An internal phase-locked loop can
synthesize the clock from a reference frequency, or the clock signal can be input directly from an
external source. Keep these clock sources in mind while reading the rest of this section.
block diagram of the system clock.
Figure 5
is a
Figure 5 System Clock Block Diagram
3.3.1 Clock Sources
The state of the clock mode (MODCLK) pin during reset determines the system clock source. When
MODCLK is held high during reset, the clock synthesizer generates a clock signal from a reference
frequency connected to the EXTAL pin. The clock synthesizer control register (SYNCR) determines
operating frequency and mode of operation. When MODCLK is held low during reset, the clock
synthesizer is disabled and an external system clock signal must be applied. The SYNCR control bits
have no effect.
The input clock is referred to as “f
of the clock system is referred to as “f
ref
”, and can be either a crystal or an external clock source. The output
”. Ensure that f
ref
and f
sys
are within normal operating limits.
sys
The reference frequency for this MCU is typically 32.768 kHz, but can range from 25 kHz to 50 kHz. To
generate a reference frequency using the crystal oscillator, a reference crystal must be connected be-
tween the EXTAL and XTAL pins.
Figure 6
shows a recommended circuit.
16/32 PLL BLOCK
PHASE
COMPARATOR
LOW-PASS
FILTER
VCO
CRYSTAL
OSCILLATOR
SYSTEM
CLOCK
SYSTEM CLOCK CONTROL
FEEDBACK DIVIDER
W
Y
X
EXTAL
XTAL
XFC
CLKOUT
MODCLK
V
DDSYN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
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| MC68CM16Z1CFC16 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC16Z Series |
| MC68CM16Z1CPV16 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC16Z Series |
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