AT90PWM2 datasheet(229/365 Pages) ATMEL

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AT90PWM2/3

4317B–AVR–02/05

The following code example shows a simple EUSART receive function.

Note:

The example code assumes that the part specific header file is included.

For I/O Registers located in extended I/O map, “IN”, “OUT”, “SBIS”, “SBIC”, “CBI”, and

“SBI” instructions must be replaced with instructions that allow access to extended I/O.

Typically “LDS” and “STS” combined with “SBRS”, “SBRC”, “SBR”, and “CBR”.

Receiving 17 Data Bit Frames

In this configuration the seventeenth bit shoud be read from the RXB8 bit register, the

rest of the most significant bits (9, 10, 11, 12, 13, 14, 15 and 16) should be read from the

EUDR register, before the low byte of the character is read from UDR.

Receive Complete Flag and

Interrupt

The EUSART Receiver has the same USART flag that indicates the Receiver state.

See “Receive Complete Flag and Interrupt” in USART section.

Receiver Error Flags

When the EUSART is not configured in Manchester mode, the EUSART has the three

same errors flags as standard mode: Frame Error (FE), Data OverRun (DOR) and Parity

Error (UPE). All can be accessed by reading UCSRA. (See “Receiver Error Flags” in

USART section).

When the EUSART is configured in Machester mode, the EUSART has two errors flags:

Data OverRun (DOR), and Manchester framing error (FEM bit of EUCSRC).

All the receiver error flags are valid only when the RxC bit is set and until the UDR regis-

ter is read.

Assembly Code Example

(1)

EUSART_Receive:

; Wait for data to be received

sbis

UCSRA, RXC

rjmp

EUSART_Receive

; Get MSB (r15), LSB (r16)

r15, EUDR

r16, UDR

ret

C Code Example(1)

unsigned int

EUSART_Receive( void )

{

unsigneg int rx_data

/* Wait for data to be received */

while

( !(UCSRA & (1<<RXC)) )

;

/* Get and return received data from buffer */

rx_data=EUDR;

rx_data=rx_data<<8+UDR;

return

rx_data;

}

AT90PWM2 Datasheet(PDF) 229 Page - ATMEL Corporation

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