ATmega48 Atmel Corporation, ATmega48 Datasheet - Page 281

• 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

27.8.13
2545T–AVR–05/11
Atmel ATmega88 boot loader parameters
In
ming are given.
Table 27-6.
Note:
Table 27-7.
For details about these two section, see
and
Table 27-8.
Note:
BOOTSZ1
Section
Read-while-write section (RWW)
No read-while-write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
Table 27-6
“RWW – Read-while-write section” on page 270
1
1
0
0
The different BOOTSZ Fuse configurations are shown in
1. Z15:Z13: Always ignored.
Z0: Should be zero for all SPM commands, byte select for the LPM instruction.
BOOTSZ0
through
Boot size configuration, ATmega88.
Read-while-write limit, ATmega88.
Explanation of different variables used in
ping to the Z-pointer, ATmega88.
PC[11:5]
PC[4:0]
1
0
1
0
11
4
Table
Boot
size
128
words
256
words
512
words
1024
words
Corresponding
27-8, the parameters used in the description of the self program-
Z-value
Z12:Z6
Z5:Z1
Pages
Z12
Z5
16
32
4
8
(1)
“NRWW – No read-while-write section” on page 270
Application
flash
section
0x000 -
0xF7F
0x000 -
0xEFF
0x000 -
0xDFF
0x000 -
0xBFF
Description
Most significant bit in the Program Counter. (The
program counter is 12 bits PC[11:0])
Most significant bit which is used to address the
words within one page (32 words in a page requires
5 bits PC [4:0]).
Bit in Z-register that is mapped to PCMSB. Because
Z0 is not used, the ZPCMSB equals PCMSB + 1.
Bit in Z-register that is mapped to PAGEMSB.
Because Z0 is not used, the ZPAGEMSB equals
PAGEMSB + 1.
Program counter page address: Page select, for
page erase and page write
Program counter word address: Word select, for
filling temporary buffer (must be zero during page
write operation)
Pages
96
32
Figure 27-3 on page 275
Boot
loader
flash
section
0xF80 -
0xFFF
0xF00 -
0xFFF
0xE00 -
0xFFF
0xC00 -
0xFFF
Figure 27-2 on page
ATmega48/88/168
Address
0x000 - 0xBFF
0xC00 - 0xFFF
End
application
section
0xF7F
0xEFF
0xDFF
0xBFF
272.
and the map-
Boot reset
address (start
boot loader
section)
0xF80
0xF00
0xE00
0xC00
281