參數(shù)資料
型號: MC56F8122VFAE
廠商: Freescale Semiconductor
文件頁數(shù): 59/136頁
文件大小: 0K
描述: IC DSP 16BIT 40MHZ 48-LQFP
標(biāo)準(zhǔn)包裝: 250
系列: 56F8xxx
核心處理器: 56800E
芯體尺寸: 16-位
速度: 40MHz
連通性: SCI,SPI
外圍設(shè)備: POR,WDT
輸入/輸出數(shù): 21
程序存儲器容量: 32KB(16K x 16)
程序存儲器類型: 閃存
RAM 容量: 4K x 16
電壓 - 電源 (Vcc/Vdd): 2.25 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 6x12b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 105°C
封裝/外殼: 48-LQFP
包裝: 托盤
產(chǎn)品目錄頁面: 734 (CN2011-ZH PDF)
External Clock Operation
56F8322 Technical Data, Rev. 16
Freescale Semiconductor
29
Preliminary
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.
Figure 3-2 Connecting a Ceramic Resonator
Note:
The OCCS_COHL bit must be set to 0 when a crystal resonator 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.
3.2.3
External Clock Source
The recommended method of connecting an external clock is illustrated in Figure 3-3. The external clock
source is connected to XTAL and the EXTAL pin is grounded.
Figure 3-3 Connecting an External Clock Register
EXTAL XTAL
Rz
Sample External Ceramic Resonator Parameters:
Rz = 750 KΩ
EXTAL XTAL
Rz
C1
CL1
CL2
C2
Resonator Frequency = 4 - 8MHz (optimized for 8MHz)
3 Terminal
2 Terminal
CLKMODE = 0
XTAL
EXTAL
External
VSS
Clock
Note: when using an external clocking
source with this configuration, the
CLKMODE and COHL bits
of the OSCTL register should be set to 1.
or GPIO
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