ATMEGA325A-MU Atmel, ATMEGA325A-MU Datasheet - Page 284
ATMEGA325A-MU
Manufacturer Part Number
ATMEGA325A-MU
Description
IC MCU AVR 32K FLASH 64VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA325A-MU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
32KB (16K x 16)
Program Memory Type
FLASH
Eeprom Size
1K x 8
Ram Size
2K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-VFQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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26.2
284
Fuse Bits
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/645
Table 26-2.
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 26-3.
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 26-3
(1)
(1)
(1)
Lock Bit Protection Modes
Extended Fuse Byte
Table 27-16 on page 327
BLB12
1
1
0
0
Bit No
7
6
5
4
3
2
1
0
-
Table 26-5
BLB11
Description
–
–
–
–
Brown-out Detector trigger level
Brown-out Detector trigger level
Brown-out Detector trigger level
External Reset Disable
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)
8285B–AVR–03/11
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