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 38/81

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ATtiny28L/V
38
1. In the same operation, write a logical “1” to WDTOE and WDE. A logical “1” must
be written to WDE even though it is set to one before the disable operation starts.
2. Within the next four clock cycles, write a logical “0” to WDE. This disables the
Watchdog.
• Bits 2..0 – WDP2, WDP1, WDP0: Watchdog Timer Prescaler 2, 1 and 0
The WDP2, WDP1 and WDP0 bits determine the Watchdog Timer prescaling when the
Watchdog Timer is enabled. The different prescaling values and their corresponding
time-out periods are shown in Table 15.
Table 15. Watchdog Timer Prescale Select
Number of WDT
Oscillator
WDP2
WDP1
WDP0
Cycles
0
0
0
16K cycles
0
0
1
32K cycles
0
1
0
64K cycles
0
1
1
128K cycles
1
0
0
256K cycles
1
0
1
512K cycles
1
1
0
1,024K cycles
1
1
1
2,048K cycles
Note:
The frequency of the Watchdog oscillator is voltage-dependent, as shown in the section
“Typical Characteristics” on page 57.
The WDR (Watchdog Reset) instruction should always be executed before the Watchdog
Timer is enabled. This ensures that the reset period will be in accordance with the
Watchdog Timer prescale settings. If the Watchdog Timer is enabled without reset, the
Watchdog Timer may not start counting from zero.
Typical
Typical
Typical
Time-out at
Time-out at
Time-out at
V
V
V
= 2.0V
= 3.0V
= 5.0V
CC
CC
CC
0.15 s
47 ms
15 ms
0.30 s
94 ms
30 ms
0.60 s
0.19 s
60 ms
1.2 s
0.38 s
0.12 s
2.4 s
0.75 s
0.24 s
4.8 s
1.5 s
0.49 s
9.6 s
3.0 s
0.97 s
19 s
6.0 s
1.9 s
1062F–AVR–07/06