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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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ATMEGA128A 데이터시트(PDF) 6 Page - ATMEL Corporation |
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ATMEGA128A 데이터시트(HTML) 6 Page - ATMEL Corporation |
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6 / 369 page  6 ATmega 128A [DATASHEET] Atmel-8151I-8-bit-AVR-ATmega128A_Datasheet-08/2014 One USART instead of two, Asynchronous mode only. Only the eight least significant bits of the Baud Rate Register is available. One 16 bits Timer/Counter with two compare registers instead of two 16-bit Timer/Counters with three compare registers. Two-wire serial interface is not supported. Port C is output only. Port G serves alternate functions only (not a general I/O port). Port F serves as digital input only in addition to analog input to the ADC. Boot Loader capabilities is not supported. It is not possible to adjust the frequency of the internal calibrated RC Oscillator. The External Memory Interface can not release any Address pins for general I/O, neither configure different wait-states to different External Memory Address sections. In addition, there are some other minor differences to make it more compatible to ATmega103: Only EXTRF and PORF exists in MCUCSR. Timed sequence not required for Watchdog Time-out change. External Interrupt pins 3 - 0 serve as level interrupt only. USART has no FIFO buffer, so data overrun comes earlier. Unused I/O bits in ATmega103 should be written to 0 to ensure same operation in ATmega128A. 2.3 Pin Descriptions 2.3.1 VCC Digital supply voltage. 2.3.2 GND Ground. 2.3.3 Port A (PA7:PA0) Port A is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port A output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port A pins that are externally pulled low will source current if the pull-up resistors are activated. The Port A pins are tri- stated when a reset condition becomes active, even if the clock is not running. Port A also serves the functions of various special features of the ATmega128A as listed on page 71. 2.3.4 Port B (PB7:PB0) Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port B output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up resistors are activated. The Port B pins are tri- stated when a reset condition becomes active, even if the clock is not running. Port B also serves the functions of various special features of the ATmega128A as listed on page 72. 2.3.5 Port C (PC7:PC0) Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The Port C output buffers have symmetrical drive characteristics with both high sink and source capability. As inputs, Port C pins that are externally pulled low will source current if the pull-up resistors are activated. The Port C pins are tri- stated when a reset condition becomes active, even if the clock is not running. |
유사한 부품 번호 - ATMEGA128A_14 |
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유사한 설명 - ATMEGA128A_14 |
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