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MC68HCL05P1A Datasheet(PDF) 58 Page - Freescale Semiconductor, Inc |
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MC68HCL05P1A Datasheet(HTML) 58 Page - Freescale Semiconductor, Inc |
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58 / 124 page  Input/Output Ports General Release Specification MC68HC05P1A — Rev. 3.0 Input/Output Ports 7.5 Port C Port C is an 8-bit bidirectional port that does not share any of its pins with other subsystems. 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 7-3). Two port C pins, PC0 and PC1, can source and sink a higher current than a typical I/O pin. See Section 10. Electrical Specifications regarding current specifications. Figure 7-3. 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 HIGH CURRENT CAPABILITY, PC0 AND PC1 ONLY Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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