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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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MC68HC705MC4MP 데이터시트(PDF) 67 Page - Freescale Semiconductor, Inc |
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MC68HC705MC4MP 데이터시트(HTML) 67 Page - Freescale Semiconductor, Inc |
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67 / 180 page  Input/Output Ports Port C General Release Specification Input/Output Ports 7.6 Port C Port C is an 8-bit bidirectional port that has shared pins with the analog-to-digital (A/D) subsystem. The port C data register is located at address $0002 and its data direction register (DDR) is located at address $0006. Reset does not affect the data registers, but clears the DDRs, thereby setting all of the port pins to input mode. Writing a 1 to a DDR bit sets the corresponding port pin to output mode. (See Figure 7-4.) The ADON bit in register ADSC is used to enable/disable the A/D subsystem. Port C may be used for general I/O applications when the A/D subsystem is disabled or when all A/D input channels are not required. Unselected channels revert to general-purpose I/O. See Section 8. Analog Subsystem. Figure 7-4. Port C I/O Circuitry READ $0002 WRITE $0002 READ $0006 DATA REGISTER BIT I/O PIN OUTPUT INTERNAL HC05 DATA BUS RESET (RST) WRITE $0006 DATA DIRECTION REGISTER BIT Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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