XR21V1412 Просмотр технического описания (PDF) - Exar Corporation

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XR21V1412

2-CH FULL-SPEED USB UART

Exar Corporation 

XR21V1412

2-CH FULL-SPEED USB UART

FIGURE 1. XR21V1412 BLOCK DIAGRAM

3.3V VCC

GND

USBD+

USBD-

SDA

SCL

USB Slave

Interface

I2C

Interface

Internal

48MHz

Oscillator

REV. 1.0.0

Fractional

BRG

128-byte

TX FIFO

384-byte

RX FIFO

Internal

Status and

Control

Registers

GPIOs/

Modem IO

UART Channel A

Fractional

BRG

128-byte

TX FIFO

384-byte

RX FIFO

Internal

Status and

Control

Registers

GPIOs/

Modem IO

UART Channel B

TXA

RXA

GPIOA5/RTSA#

GPIOA4/CTSA#

GPIOA3/DTRA#

GPIOA2/DSRA#

GPIOA1/CDA#

GPIOA0/RIA#

TXB

RXB

GPIOB5/RTSB#

GPIOB4/CTSB#

GPIOB3/DTRB#

GPIOB2/DSRB#

GPIOB1/CDB#

GPIOB0/RIB#

2

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