XR16L2550 Datasheet, PDF(34/45 Page) Exar Corporation – LOW VOLTAGE DUART WITH 16-BYTE FIFO

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XR16L2550 Datasheet, PDF (34/45 Pages) Exar Corporation – LOW VOLTAGE DUART WITH 16-BYTE FIFO

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XR16L2550

LOW VOLTAGE DUART WITH 16-BYTE FIFO

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REV. 1.0.0

TABLE 13: UART RESET CONDITIONS FOR CHANNEL A AND B

REGISTERS

RESET STATE

DLM

Bits 7-0 = 0xXX

DLL

Bits 7-0 = 0xXX

RHR

Bits 7-0 = 0xXX

THR

Bits 7-0 = 0xXX

IER

Bits 7-0 = 0x00

FCR

Bits 7-0 = 0x00

ISR

Bits 7-0 = 0x01

LCR

Bits 7-0 = 0x00

MCR

Bits 7-0 = 0x00

LSR

Bits 7-0 = 0x60

MSR

Bits 3-0 = Logic 0

Bits 7-4 = Logic levels of the inputs

inverted

SPR

Bits 7-0 = 0xFF

EFR

Bits 7-0 = 0x00

XON1

Bits 7-0 = 0x00

XON2

Bits 7-0 = 0x00

XOFF1

Bits 7-0 = 0x00

XOFF2

Bits 7-0 = 0x00

I/O SIGNALS

RESET STATE

TX

Logic 1

OP2#

Logic 1

RTS#

Logic 1

DTR#

Logic 1

RXRDY#

Logic 1

TXRDY#

Logic 0

INT

Three-State Condition

34

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