ATMEGA325A-AUR Atmel, ATMEGA325A-AUR Datasheet - Page 287

• Manufacturer Part Number: ATMEGA325A-AUR
• Description: IC MCU AVR 32K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA325A-AUR

• 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-TQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

26.6.1
8285B–AVR–03/11
Signal Names
ATmega165A/165PA/325A/325PA/3250A/3250PA/6
I n t h i s s e c t i o n , s o m e p i n s o f t h e
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P are referenced by
signal names describing their functionality during parallel programming, see
Table
The XA1/XA0 pins determine the action executed when the XTAL1 pin is given a positive pulse.
The bit coding is shown in
When pulsing WR or OE, the command loaded determines the action executed. The different
Commands are shown in
Figure 26-1. Parallel Programming
Table 26-9.
Programming Mode
Signal Name in
26-9. Pins not described in the following table are referenced by pin names.
RDY/BSY
PAGEL
DATA
BS1
XA0
XA1
BS2
WR
OE
Pin Name Mapping
Pin Name
PB7-0
RDY/BSY
Table
PD1
PD2
PD3
PD4
PD5
PD6
PD7
PA0
Table
PAGEL
+12 V
BS2
BS1
XA0
XA1
WR
OE
26-12.
26-11.
I/O
I/O
O
I
I
I
I
I
I
I
PD1
PD2
PD3
PD4
PD5
PD6
PD7
RESET
XTAL1
GND
PA0
Function
0: Device is busy programming, 1: Device is ready for new
command
Output Enable (Active low)
Write Pulse (Active low).
Byte Select 1 (“0” selects low byte, “1” selects high byte)
XTAL Action Bit 0
XTAL Action Bit 1
Program Memory and EEPROM data Page Load
Byte Select 2 (“0” selects low byte, “1” selects 2
byte)
Bi-directional Data bus (Output when OE is low).
PB7 - PB0
AVCC
VCC
+5V
+5V
DATA
Figure 26-1
nd
high
and
287