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The device is manufactured using Atmel's high-density nonvolatile memory technology. By combining an RISC 8-bit CPU
with Flash on a monolithic chip, the Atmel ATtiny12 is a powerful microcontroller that provides a highly-flexible and cost-
effective solution to many embedded control applications.
The ATtiny12 AVR is supported with a full suite of program and system development tools including: macro assemblers,
program debugger/simulators, in-circuit emulators, and evaluation kits.
Pin Descriptions
VCC
Supply voltage pin.
GND
Ground pin.
Port B (PB5..PB0)
Port B is a 6-bit I/O port. PB4..0 are I/O pins that can provide internal pull-ups (selected for each bit). On ATtiny10/11, PB5
is input only. On ATtiny12, PB5 is input or open-drain output. The port pins are tri-stated when a reset condition becomes
active, even if the clock is not running. The use of pins PB5..3 as input or I/O pins is limited, depending on reset and clock
settings, as shown below.
Table 2. PB5..PB3 Functionality vs. Device Clocking Options
Device Clocking Option
External Reset Enabled
External Reset Disabled
External Crystal
External Low-frequency Crystal
External Ceramic Resonator
External RC Oscillator
External Clock
Internal RC Oscillator
Notes:
1. "Used" means the pin is used for reset or clock purposes.
2. "-" means the pin function is unaffected by the option.
3. Input means the pin is a port input pin.
4. On ATtiny10/11, PB5 is input only. On ATtiny12, PB5 is input or open-drain output.
5. I/O means the pin is a port input/output pin.
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.
ATtiny10/11/12
PB5
(1)
Used
(3)
(4)
Input
/I/O
-
-
-
-
-
-
PB4
PB3
(2)
-
-
-
-
Used
Used
Used
Used
Used
Used
(5)
I/O
Used
I/O
Used
I/O
I/O
5
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