ATMEGA325A-MU Atmel, ATMEGA325A-MU Datasheet - Page 245
![IC MCU AVR 32K FLASH 64VQFN](/photos/12/13/121326/313-64-qfn_sml.jpg)
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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24.5.2
24.5.3
8285B–AVR–03/11
Scanning the RESET Pin
Scanning the Clock Pins
ATmega165A/165PA/325A/325PA/3250A/3250PA/6
The RESET pin accepts 5V active low logic for standard reset operation, and 12V active high
logic for High Voltage Parallel programming. An observe-only cell as shown in
page 245
Figure 24-5. Observe-only Cell
The AVR devices have many clock options selectable by fuses. These are: Internal RC Oscilla-
tor, External Clock, (High Frequency) Crystal Oscillator, Low-frequency Crystal Oscillator, and
Ceramic Resonator.
Figure 24-6 on page 245
scan chain. The Enable signal is supported with a general Boundary-scan cell, while the Oscilla-
tor/clock output is attached to an observe-only cell. In addition to the main clock, the timer
Oscillator is scanned in the same way. The output from the internal RC Oscillator is not scanned,
as this Oscillator does not have external connections.
Figure 24-6. Boundary-scan Cells for Oscillators and Clock Options
From Digital Logic
is inserted both for the 5V reset signal; RSTT, and the 12V reset signal; RSTHV.
Previous
From
Cell
From System Pin
ShiftDR
0
1
ClockDR
shows how each Oscillator with external connection is supported in the
D
UpdateDR
Q
Next
Cell
To
Previous
D
G
From
Cell
Q
ShiftDR
EXTEST
0
1
0
1
XTAL1/TOSC1
ClockDR
ENABLE
Oscillator
D
FF1
XTAL2/TOSC2
Q
OUTPUT
Next
Cell
To
Previous
From
To System Logic
Cell
ShiftDR
0
1
ClockDR
D
FF1
Q
Next
Cell
To
Figure 24-5 on
To System Logic
245
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