ATTINY4313-MU Atmel, ATTINY4313-MU Datasheet - Page 148

• Manufacturer Part Number: ATTINY4313-MU
• Description: IC MCU AVR 4K FLASH 20QFN
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY4313-MU

• 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: 18
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 20-VQFN Exposed Pad, 20-HVQFN, 20-SQFN, 20-DHVQFN
• Processor Series: ATtiny
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI, USART, USI
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 18
• Number Of Timers: 2
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -
• Lead Free Status / Rohs Status: Details

148
ATtiny2313A/4313
baud rate is given as a function parameter. For the assembly code, the baud rate parameter is
assumed to be stored in the r17:r16 registers.
Note:
Assembly Code Example
C Code Example
USART_Init:
void USART_Init( unsigned int baud )
{
}
clr r18
out UBRRH,r18
out UBRRL,r18
; Setting the XCK port pin as output, enables master mode.
sbi XCK_DDR, XCK
; Set MSPI mode of operation and SPI data mode 0.
ldi r18, (1<<UMSEL1)|(1<<UMSEL0)|(0<<UCPHA)|(0<<UCPOL)
out UCSRC,r18
; Enable receiver and transmitter.
ldi r18, (1<<RXEN)|(1<<TXEN)
out UCSRB,r18
; Set baud rate.
; IMPORTANT: The Baud Rate must be set after the transmitter is enabled!
out UBRRH, r17
out UBRRL, r18
ret
UBRR = 0;
/* Setting the XCK port pin as output, enables master mode. */
XCK_DDR |= (1<<XCK);
/* Set MSPI mode of operation and SPI data mode 0. */
UCSRC = (1<<UMSEL1)|(1<<UMSEL0)|(0<<UCPHA)|(0<<UCPOL);
/* Enable receiver and transmitter. */
UCSRB = (1<<RXEN)|(1<<TXEN);
/* Set baud rate. */
/* IMPORTANT: The Baud Rate must be set after the transmitter is enabled
*/
UBRR = baud;
1.
See ”Code Examples” on page 6.
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8246A–AVR–11/09