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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AT43USB355 датащи(PDF) 69 Page - ATMEL Corporation |
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AT43USB355 датащи(HTML) 69 Page - ATMEL Corporation |
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69 / 115 page  69 AT43USB355 2603G–USB–04/06 Port B Data Register – PORTB Port B Data Direction Register – DDRB Port B Input Pins Address – PINB The Port B Input Pins address (PINB) is not a register, and this address enables access to the physical value on each Port B pin. When reading PORTB, the Port B Data Latch is read, and when reading PINB, the logical values present on the pins are read. PortB as General Digital I/O All 8 pins in port B have equal functionality when used as digital I/O pins. PBn, General I/O Pin: The DDBn bit in the DDRB register selects the direction of this pin, if DDBn is set (one), PBn is con-figured as an output pin. If DDBn is cleared (zero), PBn is con- figured as an input pin. If PORTBn is set (one) when the pin is configured as an input pin, the MOS pull-up resistor is activated. To switch the pull-up resistor off, the PORTBn has to be cleared (zero) or the pin has to configured as an output pin. The Port B pins are tri-stated when a reset condition becomes active, even if the clock is not active. Note: n: 7, 6...0, pin number. Bit 7 6 5 4 3 2 1 0 $18 ($38) PORTB7 PORTB6 PORTB5 PORTB4 PORTB3 PORTB2 PORTB1 PORTB0 PORTB Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 7 6 5 4 3 2 1 0 $17 ($37) DDB7 DDB6 DDB5 DDB4 DDB3 DDB2 DDB1 DDB0 DDRB Read/Write R/W R/W R/W R/W R/W R/W R/W R/W Initial Value 0 0 0 0 0 0 0 0 Bit 7 6 5 4 3 2 1 0 $16 ($36) PINB7 PINB6 PINB5 PINB4 PINB3 PINB2 PINB1 PINB0 PINB Read/Write R R R R R R R R Initial Value N/A N/A N/A N/A N/A N/A N/A N/A Table 26. DDBn Effects on Port B Pins DDBn PORTBn I/O Comment 0 0 Input Tri-state (Hi-Z) 0 1 Input PBn will source current if ext. pulled low. 1 0 Output Push-Pull Zero Output 1 1 Output Push-Pull One Output |
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