User's Manual

FLC-BTM501 Datasheet
Flaircomm Microelectronics Confidential
-17-
4.7 Serial Interfaces
4.7.1 UART
This is a standard UART interface for communicating with other serial devices. The UART interface
provides a simple mechanism for communicating with other serial devices using the RS232 protocol.
When the module is connected to another digital device, UART_RX and UART_TX transfer data
between the two devices. The remaining two signals, UART_CTS and UART_RTS, can be used to
implement RS232 hardware flow control where both are active low indicators. PIO10 and PIO11 can
be configured as UART_DTR and UART_RTS.
Table 5: Possible UART Settings
When connecting the module to a host, please make sure to follow Figure 5.
Module Host
TX RX
RX TX
GND
GND
Figure 5: UART Connection
4.7.2 USB
There is a full speed (12M bits/s) USB interface for communicating with other compatible digital
devices. The module acts as a USB peripheral, responding to request from a master host controller,
such as a PC.
The module features an internal USB pull-up resistor. This pulls the USB_DP pin weakly high when
module is ready to enumerate. It signals to the USB master that it is a full speed (12Mbit/s) USB
device. The USB internal pull-up is implemented as a current source, and is compliant with section
Parameter
Possible Values
Baud Rate
Minimum
1200 baud (≤2%Error)
9600 baud (≤1%Error)
Maximum
4M baud (≤1%Error)
Flow Control
RTS/CTS or None
Parity
None, Odd or Even
Number of Stop Bits
1 or 2
Bits per Byte
8