ATmega48 Atmel Corporation, ATmega48 Datasheet - Page 302

• 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

Figure 28-8. Serial programming instruction example.
28.8.4
2545T–AVR–05/11
Byte 1
SPI serial programming characteristics
Load program memory page (high/low byte)/
Load EEPROM memory page (page access)
Bit 15 B
Byte 2
Adr MSB
Adr M M S S B
A
Figure 28-9. Serial programming waveforms.
For characteristics of the SPI module
SERIAL DATA OUTPUT
SERIAL CLOCK INPUT
SERIAL DATA INPUT
Byte 3
Adr LSB
Page offset
SAMPLE
(MOSI)
(MISO)
0
(SCK)
Serial programming instruction
Byte 4
Program memory/
EEPROM memory
MSB
MSB
Page buffer
Page N-1
Page 0
Page 1
Page 2
see “SPI timing characteristics” on page
Byte 1
Page number
Bit 15 B
Write program memory page/
Write EEPROM memory page
Byte 2
Adr MSB
ATmega48/88/168
Byte 3
Adr LSB
A A dr r L L SB B
0
309.
Byte 4
LSB
LSB
302