ATmega1280 Atmel Corporation, ATmega1280 Datasheet - Page 375

• Manufacturer Part Number: ATmega1280
• Manufacturer: Atmel Corporation

Specifications of ATmega1280

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 86
• Ext Interrupts: 32
• Usb Speed: No
• Usb Interface: No
• Spi: 5
• Twi (i2c): 1
• Uart: 4
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• 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: 4
• Pwm Channels: 15
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

31.7
2549N–AVR–05/11
5. This requirement applies to all ATmega640/1280/1281/2560/2561 2-wire Serial Interface operation. Other devices con-
6. The actual low period generated by the ATmega640/1280/1281/2560/2561 2-wire Serial Interface is (1/f
7. The actual low period generated by the ATmega640/1280/1281/2560/2561 2-wire Serial Interface is (1/f
SPI Timing Characteristics
nected to the 2-wire Serial Bus need only obey the general f
must be greater than 6MHz for the low time requirement to be strictly met at f
low time requirement will not be strictly met for f
devices connected to the bus may communicate at full speed (400kHz) with other ATmega640/1280/1281/2560/2561
devices, as well as any other device with a proper t
Figure 31-6. 2-wire Serial Bus Timing
See
Table 31-8.
Note:
SCL
SDA
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7
8
9
Figure 31-7 on page 376
t
SU;STA
1. In SPI Programming mode the minimum SCK high/low period is:
- 2 t
- 3 t
SS high to tri-state
SCK to out high
SCK high/low
SCK to SS high
SS low to SCK
SCK high/low
Rise/Fall time
Rise/Fall time
SS low to out
SPI Timing Parameters
Description
CLCL
CLCL
SCK period
SCK period
Out to SCK
SCK to out
SCK to out
Setup
Setup
Hold
Hold
for f
for f
CK
CK
t
HD;STA
< 12MHz
> 12MHz
(1)
t
SCL
of
t
LOW
and
LOW
> 308kHz when f
ATmega640/1280/1281/2560/2561
acceptance margin.
Figure 31-8 on page 376
Master
Master
Master
Master
Master
Master
Master
Master
Mode
t
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
Slave
HIGH
SCL
t
HD;DAT
requirement.
CK
t
= 8MHz. Still, ATmega640/1280/1281/2560/2561
LOW
4 • t
2 • t
Min
10
t
20
20
ck
ck
ck
SCL
t
SU;DAT
= 100kHz.
for details.
See
50% duty cycle
page 203
Table 21-5 on
0.5 • t
Typ
3.6
10
10
10
10
15
15
10
sck
t
SCL
SCL
SU;STO
- 2/f
- 2/f
t
r
1600
Max
CK
CK
), thus the
), thus f
t
BUF
ns
375
CK