25.5.6 Control A


Bit	7	6	5	4	3	2	1	0
	RXCIE	TXCIE	DREIE	RXSIE	LBME	ABEIE		RS485
Access	R/W	R/W	R/W	R/W	R/W	R/W		R/W
Reset	0	0	0	0	0	0		0

Bit 7 – RXCIE Receive Complete Interrupt Enable

This bit controls whether the Receive Complete Interrupt is enabled or not. When enabled, the interrupt will be triggered when the RXCIF bit in the USARTn.STATUS register is set.

Value	Description
0	The Receive Complete Interrupt is disabled
1	The Receive Complete Interrupt is enabled

Bit 6 – TXCIE Transmit Complete Interrupt Enable

This bit controls whether the Transmit Complete Interrupt is enabled or not. When enabled, the interrupt will be triggered when the TXCIF bit in the USARTn.STATUS register is set.

Value	Description
0	The Transmit Complete Interrupt is disabled
1	The Transmit Complete Interrupt is enabled

Bit 5 – DREIE Data Register Empty Interrupt Enable

This bit controls whether the Data Register Empty Interrupt is enabled or not. When enabled, the interrupt will be triggered when the DREIF bit in the USARTn.STATUS register is set.

Value	Description
0	The Data Register Empty Interrupt is disabled
1	The Data Register Empty Interrupt is enabled

Bit 4 – RXSIE Receiver Start Frame Interrupt Enable

This bit controls whether the Receiver Start Frame Interrupt is enabled or not. When enabled, the interrupt will be triggered when the RXSIF bit in the USARTn.STATUS register is set.

Value	Description
0	The Receiver Start Frame Interrupt is disabled
1	The Receiver Start Frame Interrupt is enabled

Bit 3 – LBME Loop-Back Mode Enable

This bit controls whether the Loop-back mode is enabled or not. When enabled, an internal connection between the TXD pin and the USART receiver is created, and the input from the RXD pin to the USART receiver is disconnected.

Value	Description
0	Loop-back mode is disabled
1	Loop-back mode is enabled

Bit 2 – ABEIE Auto-Baud Error Interrupt Enable

This bit controls whether the Auto-baud Error Interrupt is enabled or not. When enabled, the interrupt will be triggered when the ISFIF bit in the USARTn.STATUS register is set.

Value	Description
0	The Auto-Baud Error Interrupt is disabled
1	The Auto-Baud Error Interrupt is enabled

Bit 0 – RS485 RS-485 Mode

This bit controls whether the RS-485 mode is enabled or not. Refer to section RS-485 Mode for more information.

Value	Description
0	RS-485 mode is disabled
1	RS-485 mode is enabled

Name:	CTRLA
Offset:	0x05
Reset:	0x00
Property:	-