参数资料
型号: MC56F8322VFAE
厂商: Freescale Semiconductor
文件页数: 58/136页
文件大小: 0K
描述: IC DSP 16BIT 60MHZ 48-LQFP
标准包装: 250
系列: 56F8xxx
核心处理器: 56800E
芯体尺寸: 16-位
速度: 60MHz
连通性: CAN,SCI,SPI
外围设备: POR,PWM,温度传感器,WDT
输入/输出数: 21
程序存储器容量: 40KB(20K x 16)
程序存储器类型: 闪存
RAM 容量: 6K x 16
电压 - 电源 (Vcc/Vdd): 2.25 V ~ 3.6 V
数据转换器: A/D 6x12b
振荡器型: 内部
工作温度: -40°C ~ 105°C
封装/外壳: 48-LQFP
包装: 托盘
配用: MC56F8323EVME-ND - BOARD EVALUATION MC56F8323
56F8322 Techncial Data, Rev. 16
28
Freescale Semiconductor
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.
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 3-1. 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.
The crystal and associated components should be mounted as near as possible to the EXTAL and XTAL
pins to minimize output distortion and start-up stabilization time.
Figure 3-1 Connecting to a Crystal Oscillator
Note:
The OCCS_COHL bit should be set to 1 when a crystal oscillator is used. The reset condition on the
OCCS_COHL bit is 0. Please see the COHL bit in the Oscillator Control (OSCTL) register, discussed
in the 56F8300 Peripheral User Manual.
Sample External Crystal Parameters:
Rz = 750 KΩ
Note: If the operating temperature range is limited to
below 85oC (105oC junction), then Rz = 10 Meg Ω
CLKMODE = 0
EXTAL XTAL
Rz
CL1
CL2
Crystal Frequency = 4 - 8MHz (optimized for 8MHz)
EXTAL XTAL
Rz
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