ATMEGA8U2-AUR Atmel, ATMEGA8U2-AUR Datasheet - Page 251

• Manufacturer Part Number: ATMEGA8U2-AUR
• Description: MCU AVR 8K FLASH 16MHZ 32TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA8U2-AUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USB
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 22
• Program Memory Size: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -

7799D–AVR–11/10
Table 25-9.
Table 25-10. BS2 and BS1 Encoding
Table 25-11. Pin Values Used to Enter Programming Mode
Table 25-12. XA1 and XA0 Encoding
Table 25-13. Command Byte Bit Encoding
BS2
0
0
1
1
Programming Mode
Signal Name in
XA1
0
0
1
1
Command Byte
PAGEL
1000 0000
0100 0000
0010 0000
0001 0000
DATA
BS2
BS1
0
1
0
1
PAGEL
XA1
XA0
BS1
Pin
Pin Name Mapping
XA0
Flash / EEPROM
Address
Low Byte
High Byte
Extended High
Byte
Reserved
0
1
0
1
Pin Name
PB7-0
PD7
PC6
Action when XTAL1 is Pulsed
Load Flash or EEPROM Address (High or low address byte determined
by BS2 and BS1).
Load Data (High or Low data byte for Flash determined by BS1).
Load Command
No Action, Idle
Command Executed
Chip Erase
Write Fuse bits
Write Lock bits
Write Flash
Flash Data
Loading /
Reading
Low Byte
High Byte
Reserved
Reserved
I/O
I/O
I
I
Prog_enable[3]
Prog_enable[2]
Prog_enable[1]
Prog_enable[0]
Symbol
Function
Program Memory and EEPROM data Page Load.
Byte Select 2.
Bi-directional Data bus (Output when OE is low).
ATmega8U2/16U2/32U2
Fuse
Programming
Low Byte
High Byte
Extended Byte
Reserved
Value
Reading Fuse
and Lock Bits
Fuse Low Byte
Lockbits
Extended Fuse
Byte
Fuse High Byte
0
0
0
0
251