XR88C681CP View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR88C681CP

CMOS Dual Channel UART (DUART)

Exar Corporation 

1 2 3 4 5 6 7 8 9 10 Next

XR88C681

TXDA RXDA

TXDB RXDB

IP0 - IP6

OP0 - OP7

TSR

RSR

THR

RHR

Mode Registers

Status Register

Channel A

TSR

RSR

THR

RHR

Mode Registers

Status Register

Channel B

IPR

Change of

State Detectors

IPCR

ACR

Input Port

OPR

Output Port

Function Select

Logic

OPCR

Output Port

Internal Data Bus

Data

Bus

Buffer

Operation Control

CRA CRB

Command Decoder

Address Decoder

Interrupt Control

IVR

MISR

IMR

ISR

CSRA

Timing

CSRB

Bit Rate

Generator

Counter/Timer

Oscillator

D0 - D7 A0 - A3 -RD -WR -CS RESET IEI IEO -IACK -INTR

X1/CLK X2

Figure 1. Block Diagram of the XR88C681

Rev. 2.11

2

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