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 15/81

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System Control and
Reset
Reset Sources
1062F–AVR–07/06
The ATtiny28 provides three sources of reset:
Power-on Reset. The MCU is reset when the supply voltage is below the Power-on
Reset threshold (V
).
POT
External Reset. The MCU is reset when a low level is present on the RESET pin for
more than 50 ns.
Watchdog Reset. The MCU is reset when the Watchdog Timer period expires and
the Watchdog is enabled.
During reset, all I/O registers are then set to their initial values and the program starts
execution from address $000. The instruction placed in address $000 must be an RJMP
(relative jump) instruction to the reset handling routine. If the program never enables an
interrupt source, the interrupt vectors are not used, and regular program code can be
placed at these locations. The circuit diagram in Figure 16 shows the reset logic. Table 4
defines the timing and electrical parameters of the reset circuitry.
Figure 16. Reset Logic
Power-on
VCC
Reset Circuit
100 - 500K
RESET
Reset Circuit
Watchdog
Timer
On-chip
RC Oscillator
Table 4. Reset Characteristics
Symbol
Parameter
Power-on Reset Threshold Voltage (rising)
(1)
V
POT
Power-on Reset Threshold Voltage (falling)
V
RESET Pin Threshold Voltage
RST
Note:
1. The Power-on Reset will not work unless the supply voltage has been below V
(falling).
ATtiny28L/V
DATA BUS
MCU Control and Status
Register (MCUCS)
S
R
CKSEL[3..0]
Delay Counters
Full
CK
Min
Typ
1.0
1.4
0.4
0.6
0.6 V
CC
Q
Max
Unit
1.8
V
0.8
V
V
POT
15