ATMEGA328-MUR Atmel, ATMEGA328-MUR Datasheet - Page 176

• Manufacturer Part Number: ATMEGA328-MUR
• Description: IC MCU AVR 32K FLASH 32QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA328-MUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 23
• 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: 32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

18.5.3
8271C–AVR–08/10
SPDR – SPI Data Register
The SPI Data Register is a read/write register used for data transfer between the Register File
and the SPI Shift Register. Writing to the register initiates data transmission. Reading the regis-
ter causes the Shift Register Receive buffer to be read.
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
Bit
0x2E (0x4E)
Read/Write
Initial Value
MSB
R/W
X
7
R/W
6
X
R/W
X
5
R/W
X
4
R/W
X
3
R/W
X
2
R/W
1
X
LSB
R/W
X
0
Undefined
SPDR
176