ATTINY12(2003) Ver la hoja de datos (PDF) - Atmel Corporation
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ATTINY12 Datasheet PDF : 91 Pages
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Pin Descriptions
VCC
GND
Port B (PB5..PB0)
XTAL1
XTAL2
RESET
Clock Options
1006D–AVR–07/03
ATtiny11/12
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.
Supply voltage pin.
Ground pin.
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 ATtiny11, 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
PB5
Used(1)
Input(3)/I/O(4)
PB4
-(2)
-
PB3
-
-
External Crystal
-
Used
Used
External Low-frequency Crystal
-
Used
Used
External Ceramic Resonator
External RC Oscillator
-
Used
Used
-
I/O(5)
Used
External Clock
-
I/O
Used
Internal RC Oscillator
-
I/O
I/O
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 ATtiny11, 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.
Input to the inverting oscillator amplifier and input to the internal clock operating circuit.
Output from the inverting oscillator amplifier.
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.
The device has the following clock source options, selectable by Flash fuse bits as
shown:
Table 3. Device Clocking Options Select
Device Clocking Option
ATtiny11 CKSEL2..0
External Crystal/Ceramic Resonator
111
External Low-frequency Crystal
110
External RC Oscillator
101
ATtiny12 CKSEL3..0
1111 - 1010
1001 - 1000
0111 - 0101
5
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