ATmega48 Atmel Corporation, ATmega48 Datasheet - Page 369
ATmega48
Manufacturer Part Number
ATmega48
Description
Manufacturer
Atmel Corporation
Specifications of ATmega48
Flash (kbytes)
4 Kbytes
Pin Count
32
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
12
Hardware Qtouch Acquisition
No
Max I/o Pins
23
Ext Interrupts
24
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
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)
0.5
Eeprom (bytes)
256
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
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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Table of contents
2545T–AVR–05/11
1
2
3
4
5
6
7
8
9
Features ..................................................................................................... 1
Pin configurations ................................................................................... 2
Overview ................................................................................................... 5
Resources ................................................................................................. 8
Data retention ........................................................................................... 8
About code examples .............................................................................. 8
Capacitive touch sensing ........................................................................ 8
AVR CPU core .......................................................................................... 9
AVR memories ....................................................................................... 17
System clock and clock options .......................................................... 27
1.1Pin descriptions .........................................................................................................3
2.1Block diagram ............................................................................................................5
2.2Comparison between Atmel ATmega48, Atmel ATmega88, and Atmel ATmega168 .
7.1Overview ...................................................................................................................9
7.2Architectural overview ...............................................................................................9
7.3ALU – Arithmetic Logic Unit ....................................................................................10
7.4Status register .........................................................................................................11
7.5General purpose register file ...................................................................................12
7.6Stack pointer ...........................................................................................................13
7.7Instruction execution timing .....................................................................................14
7.8Reset and interrupt handling ...................................................................................15
8.1Overview .................................................................................................................17
8.2In-system reprogrammable flash program memory .................................................17
8.3SRAM data memory ................................................................................................19
8.4EEPROM data memory ...........................................................................................20
8.5I/O memory ..............................................................................................................21
8.6Register description .................................................................................................22
9.1Clock systems and their distribution ........................................................................27
9.2Clock sources ..........................................................................................................28
9.3Low power crystal oscillator ....................................................................................29
9.4Full swing crystal oscillator ......................................................................................31
6
ATmega48/88/168
i