參數(shù)資料
型號： MC56F8323
廠商： Motorola, Inc.
英文描述： 16-bit Hybrid Controllers
中文描述： 16位混合控制器
文件頁數(shù)： 62/140頁
文件大小： 1981K
代理商： MC56F8323
56F8323 Technical Data, Rev. 11.0
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.
3.2.2
Ceramic Resonator (Default)
It is also possible to drive the internal oscillator with a ceramic resonator, assuming the overall system
design can tolerate the reduced signal integrity. A typical ceramic resonator circuit is shown in Figure 3-2.
Refer to the supplier’s recommendations when selecting a ceramic resonator and associated components.
The resonator and components should be mounted as near as possible to the EXTAL and XTAL pins.
Sample External Crystal Parameters:
Rz = 750 K
Note: If the operating temperature range is limited to
below 85oC (105oC junction), then Rz = 10 Meg
CLKMODE = 0
EXTAL XTAL
Rz
CL1
CL2
Crystal Frequency = 4 - 8MHz (optimized for 8MHz)
EXTAL XTAL
Rz
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參數(shù)描述
MC56F8323EVM 功能描述:開發(fā)板和工具包 - 其他處理器 MC56F832X Dev Kit RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓:
MC56F8323EVM 制造商:Freescale Semiconductor 功能描述:Tools Development kit Kit Con
MC56F8323EVME 功能描述:開發(fā)板和工具包 - 其他處理器 MC56F8323 EVAL BRD RoHS:否 制造商:Freescale Semiconductor 產(chǎn)品:Development Systems 工具用于評估:P3041 核心:e500mc 接口類型:I2C, SPI, USB 工作電源電壓:
MC56F8323EVME 制造商:Freescale Semiconductor 功能描述:Evaluation Kit for MC56F832x and MC56F81
MC56F8323MFB60 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 60MHz 60MIPS RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風格:SMD/SMT
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