© 2015 Exar Corporation

XR22801

21 / 42

exar.com/XR22801

Rev 1B

XOFF_CHAR (0x048) - Read/Write

ERROR_STATUS (0x049) - Read Only

TX_BREAK (0x04A) - Read/Write

Bit

Default

Description

15:8

0x00

Reserved

These bits are reserved and should be written as ‘0’.

7:0

0x13

Char

XOFF ASCII character received in hexadecimal format

Bit

Default

Description

15:8

0x00

Reserved

These bits are reserved and should be written as ‘0’.

70

Break_Active

0: No break condition currently active

1: Break condition currently active

60

Overrun

0: No overrun error detected

1: Overrun error detected since last register read

50

Parity

0: No parity error detected

1: Parity error detected since last register read

40

Frame

0: No frame error detected

1: Frame error detected since last register read

30

Break

0: No break error detected

1: Break error detected since last register read

2:0

0

Reserved

These bits are reserved and should be written as ‘0’.

Bit

Default

Description

15:0

0x0000

Value

This register controls transmission of break signal. Writing a non-zero value "N" to this registers causes the

XR22801 to send a break signal on the UART TX pin for "N" ms, for 0 < N < 0xFFFF. A counter will decrement

this value at 1 ms intervals until the count reaches 0x0 at which time the break signal will stop being sent. Writ-

ing a value of 0xFFFF causes a continuous break signal to be sent, until either a value of 0x0 is written or

another non-zero value other than 0xFFFF which will again cause break signal to stop after the counter expires.