AT90PWM2 datasheet(219/361 Pages) ATMEL

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219

4317J–AVR–08/10

AT90PWM2/3/2B/3B

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”.

19.5.3

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.

19.5.4

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.

19.5.5

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).

TABLE 3.

Assembly Code Example(1)

EUSART_Receive:

; Wait for data to be received

sbis

UCSRA, RXC

rjmp

EUSART_Receive

; Get MSB (r15), LSB (r16)

lds

r15, EUDR

lds

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;

}

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