W90N745CD Datasheet, PDF (259/422 Pages) Winbond – 16/32-bit ARM microcontroller

W90N745CD/W90N745CDG
6.10 Universal Asynchronous Receiver/Transmitter Controller
Asynchronous serial communication block include 4 UART blocks and accessory logic. They can be
described as follow:
• UART0
It is merely a general purpose UART. It does not include any accessory function.
Clock Source
: 15MHz
UART Type
: general UART
FIFO Number
: 16-byte receiving FIFO and 16 byte transmitting FIFO
Modem Function
: N/A
Accessory Function : N/A
• UART1
It is designed for general purpose UART or Bluetooth transceiver. It includes a high speed
UART block with 64-byte receiving FIFO and 64-byte transmitting FIFO. It includes 5 clock
sources: 15M, 30M, 43.6M, 48M and 60M. Programmer can feel free to choose the clock
source and divisor number for suitable baud rate.
Clock Source
UART Type
FIFO Number
Modem Function
Accessory Function
Baud Rate (max)
I/O pin
: 15MHz from external crystal
30M, 43.6M, 48M, 60M (optional function for Bluetooth HCI
transport layer)
: high speed UART
: 64-byte receiving FIFO and 64 byte transmitting FIFO
: CTS and RTS (optional for Bluetooth. If they were enabled, TX & RX
in UART2 will be cut off)
: Bluetooth (optional)
: 1.875MHz
: TXD1, RXD1, RTS, CTS (optional)
• UART2
It is designed for general purpose UART or IrDA SIR. The part of UART includes 16-byte
receiving FIFO and 16-byte transmitting FIFO. TXD2/RXD2 of UART2 occupy the same
pins with RTS and CTS of UART1. Once the Bluetooth function has been enabled, UART2
should be disabled.
Clock Source
UART Type
: 15MHz
: general UART
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