参数资料
型号: MC56F8257VLH
厂商: Freescale Semiconductor
文件页数: 32/88页
文件大小: 0K
描述: DSC 64K FLASH 60MHZ 64-LQFP
标准包装: 160
系列: 56F8xxx
核心处理器: 56800E
芯体尺寸: 16-位
速度: 60MHz
连通性: CAN,I²C,LIN,SCI,SPI
外围设备: LVD,POR,PWM,WDT
输入/输出数: 54
程序存储器容量: 64KB(32K x 16)
程序存储器类型: 闪存
RAM 容量: 4K x 16
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 16x12b,D/A 1x12b
振荡器型: 内部
工作温度: -40°C ~ 105°C
封装/外壳: 64-LQFP
包装: 管件
MC56F825x/MC56F824x Digital Signal Controller, Rev. 3
General System Control Information
Freescale Semiconductor
38
when selecting a crystal, because crystal parameters determine the component values required to provide maximum stability
and reliable startup. The load capacitance values used in the oscillator circuit design should include all stray layout capacitances.
The crystal and associated components should be mounted as near as possible to the EXTAL and XTAL pins to minimize output
distortion and startup stabilization time. When using low-frequency, low-power mode, the only external component is the
crystal itself. In the other oscillator modes, load capacitors (Cx, Cy) and feedback resistor (RF) are required. In addition, a series
resistor (RS) may be used in high-gain modes. Recommended component values appear in Table 27.
Figure 9. Typical Crystal Oscillator Circuit without Frequency Compensation Capacitor
Figure 10. Typical Crystal or Ceramic Resonator Circuit
5.4.3
Alternate External Clock Input
The recommended method of connecting an external clock appears in Figure 11. The external clock source is connected to the
CLKIN pin while:
both the EXT_SEL bit and the CLK_MODE bit in the OSCTL register are set, and
corresponding bits in the GPIOB_PER register in the GPIO module and the GPS_C0 bit in the GPS0 register in the
system integration module (SIM) are set to the correct values.
The external clock input must be generated using a relatively low-impedance driver with a maximum frequency not greater than
120 MHz.
EXTAL
XTAL
MC56F825x/MC56F824x
Crystal Frequency = 4–16 MHz
OSC_DIV2 = 1 if 16 MHz is chosen
RF
EXTAL
XTAL
C1
C2
MC56F825x/MC56F824x
Crystal Frequency = 4–16 MHz
OSC_DIV2 = 1 if 16 MHz is chosen
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