ATmega1281 Atmel Corporation, ATmega1281 Datasheet - Page 372

• Manufacturer Part Number: ATmega1281
• Manufacturer: Atmel Corporation

Specifications of ATmega1281

• Flash (kbytes): 128 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 54
• Ext Interrupts: 17
• Usb Speed: No
• Usb Interface: No
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 8
• Eeprom (bytes): 4096
• Self Program Memory: YES
• 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: 6
• Output Compare Channels: 16
• Input Capture Channels: 2
• Pwm Channels: 8
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

31.5
Table 31-3.
Note:
31.5.1
2549N–AVR–05/11
Symbol
V
V
t
t
V
t
I
RST
HYST
BOD
RST
BG
BG
BG
System and Reset Characteristics
1. The Power-on Reset will not work unless the supply voltage has been below V
Standard Power-On Reset
Parameter
RESET Pin Threshold Voltage
Minimum pulse width on RESET Pin
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
Bandgap reference voltage
Bandgap reference start-up time
Bandgap reference current consumption
Reset, Brown-out and Internal voltage CharacteristicsCharacteristics
T h i s
ATmega640/1280/1281/2560/2561. The table below describes the characteristics of this power-
on reset and it is valid for the following devices only:
•
•
•
•
•
Table 31-4.
Notes:
Symbol
V
V
POT
PSR
ATmega640: revision A
ATmega1280: revision A
ATmega1281: revision A
ATmega2560: revision A to E
ATmega2561: revision A to E
i m p l e m e n t a t i o n
1. Values are guidelines only.
2. Threshold where device is released from reset when voltage is rising.
3. The power-on reset threshold voltage (falling) will not work unless the supply voltage has been
below V
Parameter
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)
Power-on slope rate
Characteristics of Standard Power-On Reset. T
POT
.
V
V
V
CC
CC
CC
o f
=2.7V, T
=2.7V, T
=2.7V, T
Condition
ATmega640/1280/1281/2560/2561
p o w e r - o n
A
A
A
= 25
= 25
= 25
°
°
°
C
C
C
r e s e t
(2)
0.2
(3)
Min
1.0
V
CC
POT
e x i s t e d
Min.
0.05
0.01
(falling).
0.7
(1)
A
Typ
1.1
50
40
10
= -40 to +85°C.
2
i n
Typ.
1.0
0.9
0.9
e a r l y
Max
(1)
2.5
1.2
70
V
CC
Max.
v e r s i o n s
1.4
1.3
4.5
(1)
Units
mV
µA
µs
µs
µs
V
V
Units
V/ms
V
V
372
o f