MC56F8322VFAE (Freescale) PDF资料下载 Datasheet(61/136 页)

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型号：	MC56F8322VFAE
厂商：	Freescale Semiconductor
文件页数：	61/136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

Freescale Semiconductor

Preliminary

3.3 Use of On-Chip Relaxation Oscillator

An internal relaxtion oscillator can supply the reference frequency when an external frequency source of

crystal is not used. During a boot or reset sequence, the relaxation oscillator is enabled by default, and the

PRECS bit in the PLLCR word is set to 0. If an external oscillator is connected, the relaxation oscillator

can be deselected instead by setting the PRECS bit in the PLLCR to 1. If a changeover between internal

and external oscillators is required at start up, internal device circuits compensate for any asynchronous

transitions between the two clock signals so that no glitches occur in the resulting master clock to the chip.

When changing clocks, the user must ensure that the clock source is not switched until the desired clock

is enabled and stable.

To compensate for variances in the device manufacturing process, the accuracy of the relaxation oscillator

can be incrementally adjusted to within + 0.1% of 8MHz by trimming an internal capacitor. Bits 0-9 of the

OSCTL (oscillator control) register allow the user to set in an additional offset (trim) to this preset value

to increase or decrease capacitance. Upon power-up, the default value of this trim is 512 units. Each unit

added or deleted changes the output frequency by about 0.1%, allowing incremental adjustment until the

desired frequency accuracy is achieved.

The internal oscillator is calibrated at the factory to 8MHz and the TRIM value is stored in the Flash

information block and loaded to the FMOPT1 register at reset. When using the relaxation oscillator, the

boot code should read the FMOPT1 register and set this value as OSCTL TRIM. For further information,

see the 56F8300 Peripheral User Manual.

3.4 Internal Clock Operation

At reset, both oscillators will be powered up; however, the relaxation oscillator will be the default clock

reference for the PLL. Software should power down the block not being used and program the PLL for the

correct frequency.

相关代理商/技术参数	参数描述
MC56F8322VFAER2	功能描述:数字信号处理器和控制器 - DSP, DSC 16 BIT HYBRID CNTRLR RoHS:否制造商:Microchip Technology 核心:dsPIC 数据总线宽度:16 bit 程序存储器大小:16 KB 数据 RAM 大小:2 KB 最大时钟频率:40 MHz 可编程输入/输出端数量:35 定时器数量:3 设备每秒兆指令数:50 MIPs 工作电源电压:3.3 V 最大工作温度:+ 85 C 封装 / 箱体:TQFP-44 安装风格:SMD/SMT
MC56F8323	制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers
MC56F8323EVM	功能描述:开发板和工具包 - 其他处理器 MC56F832X Dev Kit RoHS:否制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:
MC56F8323EVM	制造商:Freescale Semiconductor 功能描述:Tools Development kit Kit Con
MC56F8323EVME	功能描述:开发板和工具包 - 其他处理器 MC56F8323 EVAL BRD RoHS:否制造商:Freescale Semiconductor 产品:Development Systems 工具用于评估:P3041 核心:e500mc 接口类型:I2C, SPI, USB 工作电源电压:

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