ATmega325A Atmel Corporation, ATmega325A Datasheet - Page 284
ATmega325A
Manufacturer Part Number
ATmega325A
Description
Manufacturer
Atmel Corporation
Specifications of ATmega325A
Flash (kbytes)
32 Kbytes
Pin Count
64
Max. Operating Frequency
20 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
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27.2
8285D–AVR–06/11
Fuse Bits
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
Table 27-2.
Notes:
The ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P has three
Fuse bytes.
they are mapped into the Fuse bytes. Note that the fuses are read as logical zero, “0”, if they are
programmed.
Table 27-3.
Notes:
–
–
–
–
BODLEVEL2
BODLEVEL1
BODLEVEL0
RSTDISBL
Fuse Low Byte
BLB1 Mode
1
2
3
4
1. Program the Fuse bits and Boot Lock bits before programming the LB1 and LB2.
2. “1” means unprogrammed, “0” means programmed
1. See
2. Port G, PG5 is input only. Pull-up is always on.
Memory Lock Bits
(2)
84.
Table 27-3
(1)
(1)
(1)
Lock Bit Protection Modes
Extended Fuse Byte
Table 28-16 on page 327
BLB12
1
1
0
0
Bit No
7
6
5
4
3
2
1
0
-
Table 27-5
BLB11
–
–
–
–
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
External Reset Disable
Description
1
0
0
1
Protection Type
No restrictions for SPM or LPM accessing the Boot Loader
section.
SPM is not allowed to write to the Boot Loader section.
SPM is not allowed to write to the Boot Loader section, and LPM
executing from the Application section is not allowed to read
from the Boot Loader section. If Interrupt Vectors are placed in
the Application section, interrupts are disabled while executing
from the Boot Loader section.
LPM executing from the Application section is not allowed to
read from the Boot Loader section. If Interrupt Vectors are
placed in the Application section, interrupts are disabled while
executing from the Boot Loader section.
describe briefly the functionality of all the fuses and how
for BODLEVEL Fuse decoding.
(1)(2)
(Continued)
See ”Alternate Functions of Port G” on page
Default Value
1
1
1
1
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
1 (unprogrammed)
284
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