AT90CAN32 Automotive Atmel Corporation, AT90CAN32 Automotive Datasheet - Page 186

• Manufacturer Part Number: AT90CAN32 Automotive
• Manufacturer: Atmel Corporation

Specifications of AT90CAN32 Automotive

• Flash (kbytes): 32 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• Can: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 125
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

17.8.2
186
AT90CAN32/64/128
Receiving Frames with 9 Data Bits
The following code example shows a simple USART0 receive function based on polling of the
Receive Complete (RXC0) flag. When using frames with less than eight bits the most significant
bits of the data read from the UDR0 will be masked to zero. The USART0 has to be initialized
before the function can be used.
Note:
The function simply waits for data to be present in the receive buffer by checking the RXC0 flag,
before reading the buffer and returning the value.
If 9-bit characters are used (UCSZn=7) the ninth bit must be read from the RXB8n bit in UCS-
RnB before reading the low bits from the UDRn. This rule applies to the FEn, DORn and UPEn
Status Flags as well. Read status from UCSRnA, then data from UDRn. Reading the UDRn I/O
location will change the state of the receive buffer FIFO and consequently the TXB8n, FEn,
DORn and UPEn bits, which all are stored in the FIFO, will change.
Assembly Code Example
C Code Example
USART0_Receive:
unsigned char USART0_Receive (void)
{
}
; Wait for data to be received
lds
sbrs
rjmp
; Get and return received data from buffer
lds
ret
/* Wait for data to be received */
while ( ! (UCSR0A & (1<<RXC0)));
/* Get and return received data from buffer */
return UDR0;
1. The example code assumes that the part specific header file is included.
r18, UCSR0A
r18, RXC0
USART0_Receive
r16, UDR0
(1)
(1)
7682C–AUTO–04/08