AT90CAN64-16AUR Atmel, AT90CAN64-16AUR Datasheet - Page 188

• Manufacturer Part Number: AT90CAN64-16AUR
• Description: MCU AVR 64K FLASH 16MHZ 64TQFP
• Manufacturer: Atmel
• Series: AVR® 90CANr

Specifications of AT90CAN64-16AUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: CAN, EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K 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: 64-TQFP, 64-VQFP
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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AT90CAN32/64/128
The following code example shows a simple USART0 receive function that handles both nine bit
characters and the status bits.
Note:
The receive function example reads all the I/O Registers into the Register File before any com-
putation is done. This gives an optimal receive buffer utilization since the buffer location read will
be free to accept new data as early as possible.
Assembly Code Example
C Code Example
USART0_Receive:
USART0_ReceiveNoError:
unsigned int USART0_Receive(void)
{
}
; Wait for data to be received
lds
sbrs
rjmp
; Get status and 9th bit, then data from buffer
lds
lds
; If error, return -1
andi
breq
ldi
ldi
; Filter the 9th bit, then return
lsr
andi
ret
unsigned char status, resh, resl;
/* Wait for data to be received */
while ( ! (UCSR0A & (1<<RXC0)));
/* Get status and 9th bit, then data */
/* from buffer */
status = UCSR0A;
resh = UCSR0B;
resl = UDR0;
/* If error, return -1 */
if ( status & (1<<FE0)|(1<<DOR0)|(1<<UPE0) )
/* Filter the 9th bit, then return */
resh = (resh >> 1) & 0x01;
return ((resh << 8) | resl);
1. The example code assumes that the part specific header file is included.
return -1;
r18, UCSR0A
r18, RXC0
USART0_Receive
r17, UCSR0B
r16, UDR0
r18, (1<<FE0) | (1<<DOR0) | (1<<UPE0)
USART0_ReceiveNoError
r17, HIGH(-1)
r16, LOW(-1)
r17
r17, 0x01
(1)
(1)
7679H–CAN–08/08