include/regs/xmega_usart.h File Reference

XMEGA USART register definitions. More...

#include <io.h>

Go to the source code of this file.

Defines
Register Offsets
#define	USART_DATA   0x00
	TX/RX Data Register.
#define	USART_STATUS   0x01
	Status Register.
#define	USART_CTRLA   0x03
	Control Register A.
#define	USART_CTRLB   0x04
	Control Register B.
#define	USART_CTRLC   0x05
	Control Register C.
#define	USART_BAUDCTRLA   0x06
	Baud Rate Register A.
#define	USART_BAUDCTRLB   0x07
	Baud Rate Register B.
STATUS register bits
#define	USART_RXB8_BIT   0
	Receive Bit 8.
#define	USART_PERR_BIT   2
	Parity Error.
#define	USART_BUFOVF_BIT   3
	Buffer Overflow.
#define	USART_FERR_BIT   4
	Frame Error.
#define	USART_DREIF_BIT   5
	Data Register Empty.
#define	USART_TXCIF_BIT   6
	Transmit Complete.
#define	USART_RXCIF_BIT   7
	Receive Complete.
CTRLA register bits
#define	USART_DREINTLVL_START   0
	Data Reg Empty Interrupt Level.
#define	USART_DREINTLVL_SIZE   2
	Data Reg Empty Interrupt Level.
#define	USART_TXCINTLVL_START   2
	TX Complete Interrupt Level.
#define	USART_TXCINTLVL_SIZE   2
	TX Complete Interrupt Level.
#define	USART_RXCINTLVL_START   4
	RX Complete Interrupt Level.
#define	USART_RXCINTLVL_SIZE   2
	RX Complete Interrupt Level.
CTRLB register bits
#define	USART_TXB8_BIT   0
	Transmit Bit 8.
#define	USART_MPCM_BIT   1
	Multi-processor Communication Mode.
#define	USART_CLK2X_BIT   2
	Double Transmission Speed.
#define	USART_TXEN_BIT   3
	Transmitter Enable.
#define	USART_RXEN_BIT   4
	Receiver Enable.
CTRLC register bits
#define	USART_CHSIZE_START   0
	Character Size.
#define	USART_CHSIZE_SIZE   3
	Character Size.
#define	USART_SBMODE_START   3
	Stop Bit Mode.
#define	USART_SBMODE_SIZE   1
	Stop Bit Mode.
#define	USART_PMODE_START   4
	Parity Mode.
#define	USART_PMODE_SIZE   2
	Parity Mode.
#define	USART_CMODE_START   6
	Communication Mode.
#define	USART_CMODE_SIZE   2
	Communication Mode.
BAUDCTRLB register bits
#define	USART_BSELB_START   0
	Baud Rate bits 8..11.
#define	USART_BSELB_SIZE   4
	Baud Rate bits 8..11.
#define	USART_BSCALE_START   4
	Baud Rate Scale factor.
#define	USART_BSCALE_SIZE   4
	Baud Rate Scale factor.
Bit manipulation macros
#define	USART_BIT(name)   (1U << USART_##name##_BIT)
	Create a mask with bit name set.
#define	USART_BF(name, value)   ((value) << USART_##name##_START)
	Create a mask with bitfield name set to value.
#define	USART_BFEXT(name, regval)
	Extract the value of bitfield name from regval.
#define	USART_BFINS(name, value, regval)
	Return regval with bitfield name set to value.
Register access macros
#define	usart_read_reg(usart, reg)   mmio_read8((void *)((uintptr_t)(usart) + USART_##reg))
	Read the value of reg on usart.
#define	usart_write_reg(usart, reg, value)   mmio_write8((void *)((uintptr_t)(usart) + USART_##reg), value)
	Write value to reg on usart.

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Detailed Description

XMEGA USART register definitions.

Copyright (C) 2009 Atmel Corporation. All rights reserved.

Definition in file xmega_usart.h.