Datenblatt-Suchmaschine für elektronische Bauteile |
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ATTINY2313-20MU Datenblatt(PDF) 56 Page - ATMEL Corporation |
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ATTINY2313-20MU Datenblatt(HTML) 56 Page - ATMEL Corporation |
56 / 231 page 56 ATtiny2313/V 2543I–AVR–04/06 MCU Control Register – MCUCR • Bit 7 – PUD: Pull-up Disable When this bit is written to one, the pull-ups in the I/O ports are disabled even if the DDxn and PORTxn Registers are configured to enable the pull-ups ({DDxn, PORTxn} = 0b01). See “Configuring the Pin” on page 50 for more details about this feature. Alternate Functions of Port A The Port A pins with alternate functions are as shown in Table 5. Alternate Functions of Port B The Port B pins with alternate functions are shown in Table 25. The alternate pin configuration is as follows: • USCK/SCL/PCINT7 - Port B, Bit 7 USCK: Three-wire mode Universal Serial Interface Clock. SCL: Two-wire mode Serial Clock for USI Two-wire mode. PCINT7: Pin Change Interrupt source 7. The PB7 pin can serve as an external interrupt source. • DO/PCINT6 - Port B, Bit 6 DO: Three-wire mode Universal Serial Interface Data output. Three-wire mode Data out- put overrides PORTB6 value and it is driven to the port when data direction bit DDB6 is set (one). However the PORTB6 bit still controls the pull-up enabling pull-up, if direction is input and PORTB6 is set (one). PCINT6: Pin Change Interrupt Source 6. The PB6 pin can serve as an external interrupt source. Bit 7 6 5 4 3 2 1 0 PUD SM1 SE SM0 ISC11 ISC10 ISC01 ISC00 MCUCR 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 Table 24. Port A Pins Alternate Functions Port Pin Alternate Function PA2 RESET, dW PA1 XTAL2 PA0 XTAL1 Table 25. Port B Pins Alternate Functions Port Pin Alternate Functions PB7 USCK/SCL/PCINT7 PB6 DO/PCINT6 PB5 DI/SDA/PCINT5 PB4 OC1B/PCINT4 PB3 OC1A/PCINT3 PB2 OC0A/PCINT2 PB1 AIN1/PCINT1 PB0 AIN0/PCINT0 |
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