ATtiny28L Atmel Corporation, ATtiny28L Datasheet - Page 15

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ATtiny28L

Manufacturer Part Number
ATtiny28L
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATtiny28L

Flash (kbytes)
2 Kbytes
Pin Count
28
Max. Operating Frequency
4 MHz
Cpu
8-bit AVR
Hardware Qtouch Acquisition
No
Max I/o Pins
11
Ext Interrupts
10
Usb Speed
No
Usb Interface
No
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
0.03
Self Program Memory
NO
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
1
32khz Rtc
No
Calibrated Rc Oscillator
Yes
System Control and
Reset
Reset Sources
1062F–AVR–07/06
The ATtiny28 provides three sources of reset:
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
Table 4. Reset Characteristics
Note:
Symbol
V
V
RESET
POT
RST
VCC
Power-on Reset. The MCU is reset when the supply voltage is below the Power-on
Reset threshold (V
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.
(1)
1. The Power-on Reset will not work unless the supply voltage has been below V
(falling).
Parameter
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)
RESET Pin Threshold Voltage
100 - 500K
POT
RC Oscillator
Reset Circuit
Reset Circuit
).
Power-on
Watchdog
On-chip
Timer
MCU Control and Status
CKSEL[3..0]
Register (MCUCS)
CK
DATA BUS
Delay Counters
Min
1.0
0.4
ATtiny28L/V
0.6 V
Typ
1.4
0.6
Full
CC
R
S
Max
1.8
0.8
Q
Unit
V
V
V
POT
15

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