AT90S8515-8JI Atmel, AT90S8515-8JI Datasheet - Page 52

• Manufacturer Part Number: AT90S8515-8JI
• Description: IC MCU 8K FLSH 8MHZ IT 44PLCC
• Manufacturer: Atmel
• Series: AVR® 90Sr

Specifications of AT90S8515-8JI

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• 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): 4 V ~ 6 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -

UART
Data Transmission
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AT90S8515
The AT90S8515 features a full duplex (separate receive and transmit registers) Univer-
sal Asynchronous Receiver and Transmitter (UART). The main features are:
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A block schematic of the UART transmitter is shown in Figure 38.
Figure 38. UART Transmitter
Data transmission is initiated by writing the data to be transmitted to the UART I/O Data
Register, UDR. Data is transferred from UDR to the Transmit shift register when:
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Baud Rate Generator that can Generate a large Number of Baud Rates (bps)
High Baud Rates at Low XTAL Frequencies
8 or 9 Bits Data
Noise Filtering
Overrun Detection
Framing Error Detection
False Start Bit Detection
Three separate Interrupts on TX Complete, TX Data Register Empty and RX Complete
A new character has been written to UDR after the stop bit from the previous
character has been shifted out. The shift register is loaded immediately.
A new character has been written to UDR before the stop bit from the previous
character has been shifted out. The shift register is loaded when the stop bit of the
character currently being transmitted has been shifted out.
0841G–09/01