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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AT43USB353M 데이터시트(PDF) 54 Page - ATMEL Corporation |
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AT43USB353M 데이터시트(HTML) 54 Page - ATMEL Corporation |
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54 / 95 page  54 AT43USB353M 3307B–USB–4/04 ADC Characteristics I/O-Ports All AVR ports have true Read-Modify-Write functionality when used as general digital I/O ports. This means that the direction of one port pin can be changed without unintentionally changing the direction of any other pin with the SBI and CBI instructions. The same applies for changing drive value if configured as output or enabling/disabling of pull-up resistors if config- ured as input. Port A Port A is an 8-bit bi-directional I/O port. The Port A output buffers can sink or source 2 mA. Three I/O memory address locations are allocated for the Port A, one each for the Data Regis- ter PORTA, $1B($3B), Data Direction Register (DDRA), $1A($3A) and the Port A Input Pins (PINA) $19($39). The Port A Input Pins address is read only, while the Data Register and the Data Direction Register are read/write. All port pins have individually selectable pull-up resistors. When pins PA0 to PA7 are used as inputs and are externally pulled low, they will source current if the internal pull-up resistors are activated. Port A Data Register – PORTA Port A Data Direction Register – DDRA Symbol Parameter Condition Min Typ Max Units Resolution 10 Bits Integral Non-linearity V REF = VCEXTA 4 LSB Differential Non-linearity VREF = VCEXTA 4 LSB Zero Error (Offset) -2 2 LSB Full Scale Error -4 4 LSB VREF input resistance 25 °C12 18 24 k Ω Analog Input Resistance 100 M Ω Conversion Time 12 768 µs Clock Frequency at 50% duty cycle 1 MHz Bit 7 6 5 4 3 2 1 0 $1B ($3B) PORTA7 PORTA6 PORTA5 PORTA4 PORTA3 PORTA2 PORTA1 PORTA0 PORTA 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 65 43 2 1 0 $1A ($3A) DDA7 DDA6 DDA5 DDA4 DDA3 DDA2 DDA1 DDA0 DDRA 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 |
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