参数资料
型号: MC56F8025VLD
厂商: Freescale Semiconductor
文件页数: 89/161页
文件大小: 0K
描述: IC DSP 16BIT DUAL HARV 44-LQFP
标准包装: 800
系列: 56F8xxx
核心处理器: 56800E
芯体尺寸: 16-位
速度: 32MHz
连通性: I²C,LIN,SCI,SPI
外围设备: POR,PWM,WDT
输入/输出数: 35
程序存储器容量: 32KB(16K x 16)
程序存储器类型: 闪存
RAM 容量: 2K x 16
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 8x12b,D/A 2x12b
振荡器型: 内部
工作温度: -40°C ~ 105°C
封装/外壳: 44-LQFP
包装: 托盘
Overview
56F8035/56F8025 Data Sheet, Rev. 6
Freescale Semiconductor
33
Part 3 OCCS
3.1 Overview
The On-Chip Clock Synthesis (OCCS) module allows designers using an internal relaxation oscillator, an
external crystal, or an external clock to run 56F8000 family devices at user-selectable frequencies up to
32MHz. For details, see the OCCS chapter in the 56F802x and 56F803x Peripheral Reference Manual.
3.2 Features
The OCCS module interfaces to the oscillator and PLL and offers these features:
Internal relaxation oscillator
Ability to power down the internal relaxation oscillator or crystal oscillator
Ability to put the internal relaxation oscillator into Standby mode
3-bit postscaler provides control for the PLL output
Ability to power down the PLL
Provides a 2X system clock which operates at twice the system clock to the System Integration Module
(SIM)
Provides a 3X system clock which operates at three times the system clock to PWM and Timer modules
Safety shutdown feature is available if the PLL reference clock is lost
Can be driven from an external clock source
The clock generation module provides the programming interface for the PLL, internal relaxation
oscillator, and crystal oscillator.
3.3 Operating Modes
In 56F8000 family devices, an internal oscillator, an external crystal, or an external clock source can be
used to provide a reference clock to the SIM.
The 2X system clock source output from the OCCS can be described by one of the following equations:
2X system frequency = oscillator frequency
2X system frequency = (oscillator frequency x 8) / (postscaler)
where:
postscaler = 1, 2, 4, 8, 16, or 32
The SIM is responsible for further dividing these frequencies by two, which will insure a 50% duty cycle
in the system clock output.
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