ATmega48 Atmel Corporation, ATmega48 Datasheet - Page 301

• 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

Table 28-17. Serial programming instruction set (hexadecimal values). (Continued)
Notes:
2545T–AVR–05/11
Instruction/operation
Write instructions
Write program memory page
Write EEPROM memory
Write EEPROM memory page (page access)
Write lock bits
Write fuse bits
Write fuse high bits
Write extended fuse bits
1. Not all instructions are applicable for all parts.
2. a = address.
3. Bits are programmed ‘0’, unprogrammed ‘1’.
4. To ensure future compatibility, unused fuses and lock bits should be unprogrammed (‘1’).
5. Refer to the correspondig section for fuse and lock bits, calibration and signature bytes and page size.
6. Instructions accessing program memory use a word address. This word may be random within the page range.
7. See
htt://www.atmel.com/avr
(6)
If the LSB in RDY/BSY data byte out is ‘1’, a programming operation is still pending. Wait until
this bit returns ‘0’ before the next instruction is carried out.
Within the same page, the low data byte must be loaded prior to the high data byte.
After data is loaded to the page buffer, program the EEPROM page, see
for application notes regarding programming and programmers.
Byte 1
$AC
$AC
$AC
$AC
$4C
$C0
$C2
0000 00aa
0000 00aa
adr MSB
Byte 2
$E0
$A0
$A8
$A4
Instruction format
aaaa aa00
aaaa aaaa
ATmega48/88/168
adr LSB
Byte 3
$00
$00
$00
$00
Figure
28-8.
data byte in
data byte in
data byte in
data byte in
data byte in
Byte 4
$00
$00
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