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參數(shù)資料
| 型號： | DSP56857BUE |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 20/53頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC DSP 16BIT 120MHZ 100-LQFP |
| 標(biāo)準(zhǔn)包裝： | 90 |
| 系列： | 568xx |
| 核心處理器： | 56800E |
| 芯體尺寸： | 16-位 |
| 速度： | 120MHz |
| 連通性： | 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： | 100-LQFP |
| 包裝： | 托盤 |
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External Clock Operation
56857 Technical Data, Rev. 6
Freescale Semiconductor
27
4.5 External Clock Operation
The 56857 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
4.5.2
High Speed External Clock Source (> 4MHz)
The recommended method of connecting an external clock is given in Figure 4-7. The external clock
source is connected to XTAL and the EXTAL pin is held at ground, VDDA, or VDDA/2. The TOD_SEL bit
in CGM must be set to 0.
Figure 4-7 Connecting a High Speed External Clock Signal using XTAL
4.5.3
Low Speed External Clock Source (2-4MHz)
The recommended method of connecting an external clock is given in Figure 4-8. The external clock
source is connected to XTAL and the EXTAL pin is held at VDDA/2. The TOD_SEL bit in CGM must be
set to 0.
Sample External Crystal Parameters:
Rz = 10MΩ
TOD_SEL bit in CGM must be set to 0
Crystal Frequency = 2–4MHz (optimized for 4MHz)
EXTAL XTAL
Rz
56857
XTAL
EXTAL
External
GND,
VDDA,
Clock
(up to 240MHz)
or VDDA/2
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| DSP56857E | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
| DSP56857PB | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:120 MIPS Hybrid Processor |
| DSP56858 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
| DSP56858E | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:16-bit Digital Signal Controllers |
| DSP56858EVM | 制造商:Freescale Semiconductor 功能描述:Microprocessor Support IC For Use With:D |
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