参数资料
型号: DSP56F805FV80
厂商: Freescale Semiconductor
文件页数: 24/56页
文件大小: 0K
描述: IC DSP 80MHZ 64KB FLASH 144LQFP
标准包装: 60
系列: 56F8xx
核心处理器: 56800
芯体尺寸: 16-位
速度: 80MHz
连通性: CAN,EBI/EMI,SCI,SPI
外围设备: POR,PWM,WDT
输入/输出数: 32
程序存储器容量: 71KB(35.5K x 16)
程序存储器类型: 闪存
RAM 容量: 2.5K x 16
电压 - 电源 (Vcc/Vdd): 3 V ~ 3.6 V
数据转换器: A/D 8x12b
振荡器型: 外部
工作温度: -40°C ~ 85°C
封装/外壳: 144-LQFP
包装: 托盘
56F805 Technical Data, Rev. 16
30
Freescale Semiconductor
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
Table 3-8 External Clock Operation Timing Requirements3
Operating Conditions: V
SS = VSSA = 0 V, VDD = VDDA = 3.0–3.6V, 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—
80
MHz
Clock Pulse Width2, 5
2.
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.
3.
Parameters listed are guaranteed by design.
tPW
6.25
ns
56F805
XTAL
EXTAL
External
VSS
Clock
External
Clock
VIH
VIL
Note: The midpoint is VIL + (VIH – VIL)/2.
90%
50%
10%
90%
50%
10%
tPW
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