ATtiny28L

Manufacturer Part NumberATtiny28L
ManufacturerAtmel Corporation
ATtiny28L datasheets
 

Specifications of ATtiny28L

Flash (kbytes)2 KbytesPin Count28
Max. Operating Frequency4 MHzCpu8-bit AVR
Hardware Qtouch AcquisitionNoMax I/o Pins11
Ext Interrupts10Usb SpeedNo
Usb InterfaceNoGraphic LcdNo
Video DecoderNoCamera InterfaceNo
Analog Comparators1Resistive Touch ScreenNo
Temp. SensorNoCrypto EngineNo
Sram (kbytes)0.03Self Program MemoryNO
Dram MemoryNoNand InterfaceNo
PicopowerNoTemp. Range (deg C)-40 to 85
I/o Supply Class1.8 to 5.5Operating Voltage (vcc)1.8 to 5.5
FpuNoMpu / Mmuno / no
Timers132khz RtcNo
Calibrated Rc OscillatorYes  
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Page 17/81

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External Reset
1062F–AVR–07/06
activated again, without any delay, when the V
Figure 17.
If the built-in start-up delay is sufficient, RESET can be connected to VCC directly or via
an external pull-up resistor. By holding the RESET pin low for a period after V
been applied, the Power-on Reset period can be extended. Refer to Figure 18 for a tim-
ing example of this.
Figure 17. MCU Start-up, RESET Tied to VCC.
V
POT
VCC
V
RST
RESET
t
TOUT
TIME-OUT
INTERNAL
RESET
Figure 18. MCU Start-up, RESET Controlled Externally
V
POT
VCC
RESET
TIME-OUT
INTERNAL
RESET
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. When the applied voltage reaches the Reset Threshold
Voltage (V
) on its positive edge, the delay timer starts the MCU after the Time-out
RST
period (t
) has expired.
TOUT
ATtiny28L/V
decreases below detection level. See
CC
V
RST
t
TOUT
has
CC
17