ATmega325 Atmel Corporation, ATmega325 Datasheet - Page 262

• Manufacturer Part Number: ATmega325
• Manufacturer: Atmel Corporation

Specifications of ATmega325

• Flash (kbytes): 32 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 54
• Ext Interrupts: 17
• 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): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• 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: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

26.8.13
Table 26-6.
Note:
Table 26-7.
Note:
Table 26-8.
Note:
2570N–AVR–05/11
BOOTSZ1
Section
Read-While-Write section (RWW)
No Read-While-Write section (NRWW)
Variable
PCMSB
PAGEMSB
ZPCMSB
ZPAGEMSB
PCPAGE
PCWORD
1
1
0
0
1. The different BOOTSZ Fuse configurations are shown in
1. For details about these two section, see
1. Z0: should be zero for all SPM commands, byte select for the LPM instruction.
Atmel ATmega325/3250/645/6450 Boot Loader Parameters
Write Section” on page
See
Programming.
BOOTSZ0
Boot Size Configuration
Read-While-Write Limit
Explanation of different variables used in
“Addressing the Flash During Self-Programming” on page 256
1
0
1
0
PC[13/14:6/7]
PC[5/6:0]
13/14
5/6
Boot Size
In
ming are given.
1024/2048 words
2048/4096 words
512/1024 words
256/512 words
Table 26-6
252.
Corresponding
(1)
Z14/15:Z7/8
(1)
Z-value
Z6/7:Z1
Z14/15
through
Z6/7
Pages
16
32
4
8
“NRWW – No Read-While-Write Section” on page 252
Table
Application
Flash Section
0x0000-0x3EFF/
0x0000-0x7DFF
0x0000-0x3DFF/
0x0000-0x7BFF/
0x0000-0x3BFF/
0x0000-0x77FF
0x0000-0x37FF/
0x0000-0x6FFF
Most significant bit in the Program Counter. (Program Counter is 14/15 bits
PC[13/14:0])
Most significant bit which is used to address the words within one page
(64/128 words in a page requires six/seven bits PC [5/6:0]).
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 PCMSB. 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)
26-8, the parameters used in the description of the Self-Program-
Figure 26-3
224/224
Pages
32/32
Figure 26-2
and the mapping to the Z-pointer
ATmega325/3250/645/6450
for details about the use of Z-pointer during Self-
Boot Loader
Flash Section
0x3F00-0x3FFF/
0x7E00-0x7FFF
0x3E00-0x3FFF/
0x7C00-0x7FFF
0x3C00-0x3FFF/
0x7800-0x7FFF
0x3800-0x3FFF/
0x7000-0x7FFF
Address
0x0000 - x37FF/ 0x0000 - 0x6FFF
0x3800 - 0x3FFF/ 0x7000-0x7FFF
Description
End
Application
Section
0x3EFF/
0x7DFF
0x3DFF/
0x7BFF
0x3BFF/
0x77FF
0x37FF/
0x6FFF
and
“RWW – Read-While-
(1)
Boot Reset
Address
(Start
Boot Loader
Section)
0x3F00/
0x7E00
0x3E00/
0x7C00
0x3C00/
0x7800
0x3800/
0x7000
262