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ATTINY28V-1PI Datasheet(PDF) 3 Page - ATMEL Corporation |
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ATTINY28V-1PI Datasheet(HTML) 3 Page - ATMEL Corporation |
3 / 13 page 3 ATtiny28L/V 1062FS–AVR–07/06 rupt on low-level input feature enables the ATtiny28 to be highly responsive to external events, still featuring the lowest power consumption while in the power-down modes. The device is manufactured using Atmel’s high-density, nonvolatile memory technology. By combining an enhanced RISC 8-bit CPU with Flash on a monolithic chip, the Atmel ATtiny28 is a powerful microcontroller that provides a highly flexible and cost-effective solution to many embedded control applications. The ATtiny28 AVR is supported with a full suite of program and system development tools including: macro assemblers, pro- gram debugger/simulators, in-circuit emulators and evaluation kits. Pin Descriptions VCC Supply voltage pin. GND Ground pin. Port A (PA3..PA0) Port A is a 4-bit I/O port. PA2 is output-only and can be used as a high-current LED driver. At V CC = 2.0V, the PA2 output buffer can sink 25 mA. PA3, PA1 and PA0 are bi-directional I/O pins with internal pull-ups (selected for each bit). The port pins are tri- stated when a reset condition becomes active, even if the clock is not running. Port B (PB7..PB0) Port B is an 8-bit input port with internal pull-ups (selected for all Port B pins). Port B pins that are externally pulled low will source current if the pull-ups are activated. Port B also serves the functions of various special features of the ATtiny28 as listed on page 27. If any of the special features are enabled, the pull-up(s) on the corresponding pin(s) is automatically disabled. The port pins are tri-stated when a reset condition becomes active, even if the clock is not running. Port D (PD7..PD0) Port D is an 8-bit I/O port. Port pins can provide internal pull-up resistors (selected for each bit). The port pins are tri-stated when a reset condition becomes active, even if the clock is not running. XTAL1 Input to the inverting oscillator amplifier and input to the internal clock operating circuit. XTAL2 Output from the inverting oscillator amplifier. RESET Reset input. An external reset is generated by a low level on the RESET pin. Reset pulses longer than 50 ns will generate a reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset. |
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