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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Register Description
Oscillator Calibration Register
– OSCCAL
1062F–AVR–07/06
Bit
7
6
5
$00
CAL7
CAL6
CAL5
Read/Write
R/W
R/W
R/W
Initial Value
0
0
0
• Bits 7..0 – CAL7..CAL0: Oscillator Calibration Value
Writing the calibration byte to this address will trim the internal oscillator to remove pro-
cess variation from the oscillator frequency. When OSCCAL is zero, the lowest available
frequency is chosen. Writing non-zero values to the register will increase the frequency
to the internal oscillator. Writing $FF to the register gives the highest available fre-
quency. Table 2 shows the range for OSCCAL. Note that the oscillator is intended for
calibration to 1.2 MHz, thus tuning to other values is not guaranteed. At 3V and 25
the pre-programmed calibration byte gives a frequency within ± 1% of the nominal
frequency.
Table 2. Internal RC Oscillator Range
OSCCAL Value
Min Frequency
0x00
0.6 MHz
0x7F
0.8 MHz
0xFF
1.2 MHz
ATtiny28L/V
4
3
2
1
CAL4
CAL3
CAL2
CAL1
CAL0
R/W
R/W
R/W
R/W
R/W
0
0
0
0
Max Frequency
1.2 MHz
1.7 MHz
2.5 MHz
0
OSCCAL
0
o
C,
9