ATmega48 Atmel Corporation, ATmega48 Datasheet - Page 372

• Manufacturer Part Number: ATmega48
• 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

2545T–AVR–05/11
19 SPI – Serial peripheral interface ......................................................... 161
20 USART0 ................................................................................................. 171
21 USART in SPI mode ............................................................................. 199
18.3Timer/counter clock sources ...............................................................................141
18.4Counter unit .........................................................................................................141
18.5Output compare unit ............................................................................................142
18.6Compare match output unit .................................................................................144
18.7Modes of operation ..............................................................................................145
18.8Timer/counter timing diagrams ............................................................................149
18.9Asynchronous operation of Timer/Counter2 ........................................................151
18.10Timer/counter prescaler ....................................................................................152
18.11Register description ...........................................................................................153
19.1Features ..............................................................................................................161
19.2Overview .............................................................................................................161
19.3SS pin functionality ..............................................................................................166
19.4Data modes .........................................................................................................166
19.5Register description .............................................................................................168
20.1Features ..............................................................................................................171
20.2Overview .............................................................................................................171
20.3Clock generation .................................................................................................172
20.4Frame formats .....................................................................................................175
20.5USART initialization .............................................................................................176
20.6Data transmission – The USART transmitter ......................................................179
20.7Data reception – The USART receiver ................................................................181
20.8Asynchronous data reception ..............................................................................185
20.9Multi-processor communication mode .................................................................188
20.10Register description ...........................................................................................190
20.11Examples of baud rate setting ...........................................................................194
21.1Features ..............................................................................................................199
21.2Overview .............................................................................................................199
21.3Clock generation .................................................................................................199
21.4SPI data modes and timing .................................................................................200
21.5Frame formats .....................................................................................................201
21.6Data transfer ........................................................................................................203
21.7AVR USART MSPIM vs. AVR SPI ......................................................................205
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