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68HC705JJ7_1 参数 Datasheet PDF下载

68HC705JJ7_1图片预览
型号: 68HC705JJ7_1
PDF下载: 下载PDF文件 查看货源
内容描述: 常规版本规格 [General Release Specification]
分类和应用:
文件页数/大小: 230 页 / 5548 K
品牌: FREESCALE [ Freescale ]
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Freescale Semiconductor, Inc.  
Pa ra lle l Inp ut/ Outp ut  
7.2 Introd uc tion  
The MC68HC705JJ7 has 14 bidirectional I/O pins which form two  
parallel I/O ports, A and B. The MC68HC705JP7 has 22 bidirectional I/O  
pins which form three parallel I/O ports, A, B and C. Each I/O pin is  
programmable as an input or an output. The contents of the data  
direction registers determine the data direction of each of the I/O pins.  
All I/O pins have software programmable pulldown devices which can be  
enabled or disabled globally by the SWPDI bit in the mask option register  
(MOR).  
7.3 Port A  
Port A is a 6-bit, general-purpose bidirectional I/O port with these  
features:  
• Individual programmable pulldown devices  
• High current sinking capability on all port A pins, with a maximum  
total for port A  
• High current sourcing capability on all port A pins, with a maximum  
total for port A  
• External interrupt capability (pins PA3–PA0)  
General Release Specification  
MC68HC705JJ7/MC68HC705JP7 Rev. 3.0  
Parallel Input/Output  
For More Information On This Product,  
Go to: www.freescale.com  
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