ATMEGA162V-8AJ Atmel, ATMEGA162V-8AJ Datasheet - Page 177

• Manufacturer Part Number: ATMEGA162V-8AJ
• Description: IC MCU AVR 16K 5V 8MHZ 44-TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA162V-8AJ

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: EBI/EMI, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 35
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Data Converters: -

Receiving Frames with
9 Data Bits
2513K–AVR–07/09
If 9-bit characters are used (UCSZ=7) the ninth bit must be read from the RXB8 bit in UCSRB
before reading the low bits from the UDR. This rule applies to the FE, DOR and UPE Status
Flags as well. Read status from UCSRA, then data from UDR. Reading the UDR I/O location will
change the state of the receive buffer FIFO and consequently the TXB8, FE, DOR and UPE bits,
which all are stored in the FIFO, will change.
The following code example shows a simple USART receive function that handles both nine bit
characters and the status bits.
Note:
Assembly Code Example
C Code Example
USART_Receive:
USART_ReceiveNoError:
unsigned int USART_Receive( void )
{
}
; Wait for data to ?e received
sbis UCSRA, RXC
rjmp USART_Receive
; Get status and 9t? bit, then data from buffer
in
in
in
; If error, return ?1
andi r18,(1<<FE)|(1<<DOR)|(1<<UPE)
breq USART_ReceiveNoError
ldi
ldi
; Filter the 9th bi?, then return
lsr
andi r17, 0x01
ret
unsigned char statu?, resh, resl;
/* Wait for data to?be received */
while ( !(UCSRA & (?<<RXC)) )
/* Get status and 9?h bit, then data */
/* from buffer */
status = UCSRA;
resh = UCSRB;
resl = UDR;
/* If error, return?-1 */
if ( status & (1<<F?)|(1<<DOR)|(1<<UPE) )
/* Filter the 9th b?t, then return */
resh = (resh >> 1) & 0x0?;
return ((resh << 8)?| resl);
1. The example code assumes that the part specific header file is included.
return -1;
r18, UCSRA
r17, UCSRB
r16, UDR
r17, HIGH(-1)
r16, LOW(-1)
r17
;
(1)
(1)
ATmega162/V
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