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| 型號： | DSP56F801EVM |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 18/48頁 |
| 文件大?。?/td> | 0K |
| 描述： | KIT EVALUATION FOR DSP56F801 |
| 標(biāo)準(zhǔn)包裝： | 1 |
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External Clock Operation
56F801 Technical Data, Rev. 17
Freescale Semiconductor
25
3.5.3
External Clock Source
The recommended method of connecting an external clock is given in Figure 3-9. The external clock
source is connected to XTAL and the EXTAL pin is grounded.
Figure 3-9 Connecting an External Clock Signal
Figure 3-10 External Clock Timing
3.5.4
Use of On-Chip Relaxation Oscillator
An internal relaxation oscillator can supply the reference frequency when an external frequency source or
crystal are not used. During a 56F801 boot or reset sequence, the relaxation oscillator is enabled by default,
and the PRECS bit in the PLLCR word is set to 0 (Section 3.5). If an external oscillator is connected, the
relaxation oscillator can be deselected instead by setting the PRECS bit in the PLLCR to 1. When this
occurs, the PRECSS bit in the PLLSR (prescaler clock select status register) data word also sets to 1. If a
changeover between internal and external oscillators is required at startup, internal device circuits
Table 3-8 External Clock Operation Timing Requirements3
Operating Conditions: V
SS = VSSA = 0 V, VDD = VDDA = 3.0–3.6 V, TA = –40° to +85°C
Characteristic
Symbol
Min
Typ
Max
Unit
Frequency of operation (external clock driver)1
1.
See Figure 3-9 for details on using the recommended connection of an external clock driver.
fosc
0—
802
2.
May not exceed 60MHz for the DSP56F801FA60 device.
3.
The high or low pulse width must be no smaller than 6.25ns or the chip will not function. However, the high pulse width
does not have to be any particular percent of the low pulse width.
4.
Parameters listed are guaranteed by design.
MHz
Clock Pulse Width3, 4
tPW
6.25
—
ns
56F801
XTAL
EXTAL
External Clock
VSS
External
Clock
VIH
VIL
Note: The midpoint is VIL + (VIH – VIL)/2.
90%
50%
10%
90%
50%
10%
tPW
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DSP56F801EVMUM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:56F801 Evaluation Module Hardware User＇s Manual |
| DSP56F801FA60 | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 60Mhz/30MIPS RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| DSP56F801FA60E | 功能描述:數(shù)字信號處理器和控制器 - DSP, DSC 16 BIT HYBRID CONTROLLER RoHS:否 制造商:Microchip Technology 核心:dsPIC 數(shù)據(jù)總線寬度:16 bit 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:2 KB 最大時鐘頻率:40 MHz 可編程輸入/輸出端數(shù)量:35 定時器數(shù)量:3 設(shè)備每秒兆指令數(shù):50 MIPs 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TQFP-44 安裝風(fēng)格:SMD/SMT |
| DSP56F801FA60E | 制造商:Freescale Semiconductor 功能描述:Digital Signal Processor IC DSP Type:Pro |
| DSP56F801FA60E | 制造商:Freescale Semiconductor 功能描述:DIGITAL SIGNAL PROCESSORLQFP3.6V |
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