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| XR21V1412_10 Datasheet, PDF (2/30 Pages) Exar Corporation – 2-CH FULL-SPEED USB UART | |||
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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. 1.1.0
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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