参数资料
型号: MC56F8155VFGE
厂商: Freescale Semiconductor
文件页数: 102/172页
文件大小: 0K
描述: IC DSP 16BIT 40MHZ 128-LQFP
标准包装: 72
系列: 56F8xxx
核心处理器: 56800E
芯体尺寸: 16-位
速度: 40MHz
连通性: EBI/EMI,SCI,SPI
外围设备: POR,PWM,WDT
输入/输出数: 49
程序存储器容量: 256KB(128K x 16)
程序存储器类型: 闪存
RAM 容量: 8K x 16
电压 - 电源 (Vcc/Vdd): 2.25 V ~ 3.6 V
数据转换器: A/D 16x12b
振荡器型: 外部
工作温度: -40°C ~ 105°C
封装/外壳: 128-LQFP
包装: 托盘
Introduction
56F8355 Technical Data, Rev. 17
Freescale Semiconductor
35
Preliminary
Part 3 On-Chip Clock Synthesis (OCCS)
3.1 Introduction
Refer to the OCCS chapter of the 56F8300 Peripheral User Manual for a full description of the OCCS.
The material contained here identifies the specific features of the OCCS design. Figure 3-1 shows the
specific OCCS block diagram to reference from the OCCS chapter of the 56F8300 Peripheral User
Manual.
Figure 3-1 OCCS Block Diagram
3.2 External Clock Operation
The system clock can be derived from an external crystal, ceramic resonator, or an external system clock
signal. To generate a reference frequency using the internal oscillator, a reference crystal or ceramic
resonator must be connected between the EXTAL and XTAL pins.
3.2.1
Crystal Oscillator
The internal oscillator is designed to interface with a parallel-resonant crystal resonator in the frequency
range specified for the external crystal in Table 10-15. A recommended crystal oscillator circuit is shown
in Figure 3-2. Follow the crystal supplier’s recommendations when selecting a crystal, since crystal
parameters determine the component values required to provide maximum stability and reliable start-up.
MUX
EXTAL
XTAL
FE
ED
BA
C
K
LCK
Prescaler CLK
Postscaler CLK
FOUT/2
Crystal
OSC
Loss of
Reference
Clock
Detector
Lock
Detector
ZSRC
Bus Interface & Control
FOUT
F
REF
PLLDB
PLLCOD
PLLCID
Bus
Interface
Loss of Reference
Clock Interrupt
SYS_CLK2
Source to SIM
MUX
CLKMODE
÷2
Prescaler
÷ (1,2,4,8)
Postscaler
÷ (1,2,4,8)
MS
TR
_
OS
C
PLL
x (1 to 128)
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