參數(shù)資料
型號: DSP56858FVE
廠商: Freescale Semiconductor
文件頁數(shù): 21/64頁
文件大小: 0K
描述: IC DSP 16BIT 120MHZ 144-LQFP
標準包裝: 60
系列: 568xx
核心處理器: 56800E
芯體尺寸: 16-位
速度: 120MHz
連通性: EBI/EMI,SCI,SPI,SSI
外圍設(shè)備: DMA,POR,WDT
輸入/輸出數(shù): 47
程序存儲器容量: 80KB(40K x 16)
程序存儲器類型: SRAM
RAM 容量: 24K x 16
電壓 - 電源 (Vcc/Vdd): 1.62 V ~ 1.98 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 144-LQFP
包裝: 托盤
56858 Technical Data, Rev. 6
28
Freescale Semiconductor
Figure 4-5 shows the definitions of the following signal states:
Active state, when a bus or signal is driven, and enters a low impedance state
Tri-stated, when a bus or signal is placed in a high impedance state
Data Valid state, when a signal level has reached VOL or VOH
Data Invalid state, when a signal level is in transition between VOL and VOH
Figure 4-5 Signal States
4.5 External Clock Operation
The 56858 system clock can be derived from a crystal or an external system clock signal. To generate a
reference frequency using the internal oscillator, a reference crystal must be connected between the
EXTAL and XTAL pins.
4.5.1
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 4-6. In Figure 4-6 a typical crystal oscillator circuit is
shown. Follow the crystal supplier’s recommendations when selecting a crystal, because crystal
parameters determine the component values required to provide maximum stability and reliable start-up.
The crystal and associated components should be mounted as close as possible to the EXTAL and XTAL
pins to minimize output distortion and start-up stabilization time.
Figure 4-6 Crystal Oscillator
Data Invalid State
Data1
Data2 Valid
Data
Tri-stated
Data3 Valid
Data2
Data3
Data1 Valid
Data Active
Sample External Crystal Parameters:
Rz = 10MΩ
TOD_SEL bit in CGM must be set to 0
fc = 4MHz
Crystal Frequency = 2–4MHz (optimized for 4MHz)
EXTAL XTAL
Rz
fC
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