Specifications

Bluegiga Technologies Oy
Page 30 of 64
8 Serial Interfaces
8.1 UART Interface
WT32i has a standard UART serial interface that provides a simple mechanism for communicating with other
serial devices using the RS232 protocol. UART configuration parameters, such as baud rate, parity and stop
bits can be configured with an iWRAP command.
The hardware flow control is enabled by default. HW flow control can be disabled in HW by connecting
UART_NCTS to GND and leaving UART_NRTS floating.
Parameter
Possible Values
Baud rate
Minimum
1200 baud (≤2%Error)
9600 (≤1%Error)
Maximum
4Mbaud (≤1%Error)
Flow control
RTS/CTS or None
Parity
None, Odd, Even
Number of stop bits
1 or 2
Bits per byte
8
Table 16: Possible UART settings
iWRAP Example: Configuring local UART to 9600bps, 8 data bits, no parity and 1 stop bit
SET CONTROL BAUD 9600, 8N1
(9600 = baud rate, N = No parity, 1 = 1 stop bit)
Baud Rate
Error
1200
1.73%
2400
1.73%
4800
1.73%
9600
-0.82%
19200
0.45%
38400
-0.18%
57600
0.03%
76800
0.14%
115200
0.03%
230400
0.03%
460800
-0.02%
921600
0.00%
1382400
-0.01%
1843200
0.00%
2764800
0.00%
3686400
0.00%
Table 17: Standard Baud Rates