ATMEGA3250P-20AUR Atmel, ATMEGA3250P-20AUR Datasheet - Page 154

• Manufacturer Part Number: ATMEGA3250P-20AUR
• Description: MCU AVR 32K FLASH 20MHZ 100TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA3250P-20AUR

• 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: 69
• 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): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

17. SPI – Serial Peripheral Interface
17.1
17.2
8023F–AVR–07/09
Features
Overview
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The Serial Peripheral Interface (SPI) allows high-speed synchronous data transfer between the
ATmega325P/3250P and peripheral devices or between several AVR devices. A simplified block
diagram of the Serial Peripheral Interface is shown in
The PRSPI bit in
enable the SPI module.
Figure 17-1. SPI Block Diagram
Note:
Full-duplex, Three-wire Synchronous Data Transfer
Master or Slave Operation
LSB First or MSB First Data Transfer
Seven Programmable Bit Rates
End of Transmission Interrupt Flag
Write Collision Flag Protection
Wake-up from Idle Mode
Double Speed (CK/2) Master SPI Mode
1. Refer to
/2/4/8/16/32/64/128
DIVIDER
”PRR – Power Reduction Register” on page 44
Figure 1-1 on page
(1)
2, and
Table 13-3 on page 71
Figure
ATmega325P/3250P
17-1.
for SPI pin placement.
must be written to zero to
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