ATmega1284 Atmel Corporation, ATmega1284 Datasheet - Page 37

• Manufacturer Part Number: ATmega1284
• Manufacturer: Atmel Corporation

Specifications of ATmega1284

• Flash (kbytes): 128 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 32
• Ext Interrupts: 32
• 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): 16
• 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: 3
• Output Compare Channels: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

9.7
8272C–AVR–06/11
128kHz Internal Oscillator
When this Oscillator is selected, start-up times are determined by the SUT Fuses as shown in
Table 9-11 on page
Table 9-11.
Note:
The 128kHz internal Oscillator is a low power Oscillator providing a clock of 128kHz. The fre-
quency is nominal at 3V and 25°C. This clock may be select as the system clock by
programming the CKSEL Fuses to “0011” as shown in
Table 9-12.
Note:
When this clock source is selected, start-up times are determined by the SUT Fuses as shown in
Table
Table 9-13.
Power Conditions
BOD enabled
Fast rising power
Slowly rising power
BOD enabled
Fast rising power
Slowly rising power
Power Conditions
9-13.
1.
1. Note that the 128kHz oscillator is a very low power clock source, and is not designed for high
The device is shipped with this option selected.
accuracy.
ATmega164A/PA/324A/PA/644A/PA/1284/P
Start-up times for the Internal Calibrated RC Oscillator clock selection
128kHz Internal Oscillator Operating Modes
Start-up Times for the 128kHz Internal Oscillator
Nominal Frequency
37.
128kHz
Start-up Time from Power-
Start-up Time from Power-
down and Power-save
down and Power-save
Reserved
Reserved
6 CK
6 CK
6 CK
6 CK
6 CK
6 CK
Table
(2)
Additional Delay from
Additional Delay from
9-12.
Reset (V
14CK + 4.1ms
14CK + 65ms
14CK + 64ms
14CK + 4ms
Reset
14CK
14CK
CC
CKSEL3..0
= 5.0V)
0011
SUT1..0
SUT1..0
10
00
01
11
00
01
10
11
(1)
37