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68HC705JJ7_1 参数 Datasheet PDF下载

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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.  
Ge ne ra l Re le a se Sp e c ific a tion MC68HC705JJ7/ MC68HC705JP7  
Se c tion 9. Sim p le Se ria l Inte rfa c e  
9.1 Conte nts  
9.2  
Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .137  
9.3  
SIOP Signal Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139  
Serial Clock (SCK) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .139  
Serial Data Input (SDI) . . . . . . . . . . . . . . . . . . . . . . . . . . .140  
Serial Data Output (SDO) . . . . . . . . . . . . . . . . . . . . . . . . .140  
9.3.1  
9.3.2  
9.3.3  
9.4  
SIOP Registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .141  
SIOP Control Register (SCR) . . . . . . . . . . . . . . . . . . . . . .141  
SIOP Status Register (SSR) . . . . . . . . . . . . . . . . . . . . . . .144  
SIOP Data Register (SDR) . . . . . . . . . . . . . . . . . . . . . . . .145  
9.4.1  
9.4.2  
9.4.3  
9.2 Introd uc tion  
The simple synchronous serial I/O port (SIOP) subsystem is designed to  
provide efficient serial communications with peripheral devices or other  
MCUs. SIOP is implemented as a 3-wire master/slave system with serial  
clock (SCK), serial data input (SDI), and serial data output (SDO). A  
block diagram of the SIOP is shown in Figure 9-1.  
The SIOP subsystem shares its input/output pins with port B. When the  
SIOP is enabled (SPE bit set in the SCR), the port B data direction and  
data registers are bypassed by the SIOP. The port B data direction and  
data registers will remain accessible and can be altered by the  
application software, but these actions will not affect the SIOP  
transmitted or received data.  
MC68HC705JJ7/MC68HC705JP7 Rev. 3.0  
General Release Specification  
Simple Serial Interface  
For More Information On This Product,  
Go to: www.freescale.com  
 
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