NUTINY-SDK-100 Nuvoton Technology Corporation of America, NUTINY-SDK-100 Datasheet - Page 57

• Manufacturer Part Number: NUTINY-SDK-100
• Description: BOARD EVALUATION NUC100 SERIES
• Manufacturer: Nuvoton Technology Corporation of America
• Series: NuMicro™r
• Type: MCUr

Specifications of NUTINY-SDK-100

• Contents: Board, Cable
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: NUC100 Series

The UART0 and UART1 controllers support auto-flow control function that uses two low-level
signals, /CTS (clear-to-send) and /RTS (request-to-send), to control the flow of data transfer
between the UART and external devices (ex: Modem). When auto-flow is enabled, the UART is
not allowed to receive data until the UART asserts /RTS to external device. When the number of
bytes in the RX FIFO equals the value of RTS_TRI_LEV (UA_FCR [19:16]), the /RTS is de-
asserted. The UART sends data out when UART controller detects /CTS is asserted from external
device. If a valid asserted /CTS is not detected the UART controller will not send data out.
The UART controllers also provides Serial IrDA (SIR, Serial Infrared) function (User must set
IrDA_EN (UA_FUN_SEL [1]) to enable IrDA function). The SIR specification defines a short-range
infrared asynchronous serial transmission mode with one start bit, 8 data bits, and 1 stop bit. The
maximum data rate is 115.2 Kbps (half duplex). The IrDA SIR block contains an IrDA SIR
Protocol encoder/decoder. The IrDA SIR protocol is half-duplex only. So it cannot transmit and
receive data at the same time. The IrDA SIR physical layer specifies a minimum 10ms transfer
delay between transmission and reception. This delay feature must be implemented by software.
The alternate function of UART controllers is LIN (Local Interconnect Network) function. The LIN
mode is selected by setting the LIN_EN bit in UA_FUN_SEL register. In LIN mode, one start bit
and 8-bit data format with 1-bit stop bit are required in accordance with the LIN standard.
For NuMicro™ NUC100 Low Density, another alternate function of UART controllers is RS-485 9
bit mode function, and direction control provided by RTS pin or can program GPIO (PB.2 for
RTS0 and PB.6 for RTS1) to implement the function by software. The RS-485 mode is selected
by setting the UA_FUN_SEL register to select RS-485 function. The RS-485 driver control is
implemented using the RTS control signal from an asynchronous serial port to enable the RS-485
driver. In RS-485 mode, many characteristics of the RX and TX are same as UART.
57600
38400
19200
9600
4800
Table 5-4 UART Baud Rate Setting Table
A=142
A=286
A=22
A=34
A=70
- 57 -
A=190,B=11
A=142,B=15
A=382,B=11
A=286,B=15
A=14,B=11
A=22,B=15
A=30,B=11
A=46,B=11
A=34,B=15
A=126,B=8
A=94,B=11
A=70,B=15
A=254,B=8
A=510,B=8
A=62,B=8
NuMicro™ NUC100 Data Sheet
Publication Release Date: Nov 11, 2010
A=1150
A=2302
A=4606
A=382
A=574
Revision V2.00