NCT6627UD Nuvoton Technology Corporation of America, NCT6627UD Datasheet - Page 132

• Manufacturer Part Number: NCT6627UD
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of NCT6627UD

• Lead Free Status / Rohs Status: Supplier Unconfirmed

W83627UHG supports RS485 auto flow control function for UARTA, UARTC, UARTD and URATE. When
enabling the RS485 auto control function, it will automatically drive RTS# pin to logic high or low for UARTA,
UARTC, UARTD and URATE when UART TX block transmits the data.
URATE.
The default behavior of RTS# pin will drive logic high the time edge between Start bit and bit0 when the UART
TX Block start to transmits the data on SOUT pin. Then the RTS# pin will drive logic low later than Stop bit about
1~2 x Bit-time when UART TX Block completes the data transmission. The driving behavior of RTS# will be
inverted when we set RS485_RTS_inv_sel bit = 1’b1. (Bit-time: Depends on the baud rate of transmission)
Only one global CR2B register, on page 164, relates to the RS485 auto flow control function for UARTA, UARTC,
UARTD and URATE. (See the bellowing table)
The diagram shown below illustrates the RS485 auto flow control function for UARTA, UARTC, UARTD and
RTS485_inv_sel
RTS485_enable
CR2B_Bit7
CR2B_Bit3
UARTA
CR2B_Bit6
CR2B_Bit2
UARTC
-123-
W83627UHG/NCT6627UD
CR2B_Bit5
CR2B_Bit1
Publication Release Date: October 26, 2010
UARTD
CR2B_Bit4
CR2B_Bit0
UARTE
Revision 1.7