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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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68HC705SP7 датащи(PDF) 101 Page - Freescale Semiconductor, Inc |
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68HC705SP7 датащи(HTML) 101 Page - Freescale Semiconductor, Inc |
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101 / 230 page  Parallel Input/Output Port C (28-Pin Versions Only) MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0 General Release Specification Parallel Input/Output 7.5.4 Port C Logic Figure 7-15 shows the I/O logic of port C. When a port C pin is programmed as an output, reading the port bit actually reads the value of the data latch and not the voltage on the pin itself. When a port C pin is programmed as an input, reading the port bit reads the voltage level on the pin. The data latch can always be written, regardless of the state of its DDR bit. Table 7-4 summarizes the operations of the port C pins. Figure 7-15. Port C I/O Circuit PCx PORT C DATA REGISTER BIT PCx READ $0006 WRITE $0002 READ $0002 WRITE $0010 PULLDOWN DEVICE RESET WRITE $0006 DATA DIRECTION REGISTER C BIT DDRCx PULLDOWN REGISTER A BIT PDICx R R MASK OPTION REGISTER ($1FF1) HIGH SINK/SOURCE CURRENT CAPABILITY Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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