BC41B143A-DS-001PE Datasheet, PDF (63/102 Pages) List of Unclassifed Manufacturers – BlueCpre 4-ROM Single Chip Bluetooth v2.0 System with EDR

Device Terminal Descriptions
10.4 UART Interface
BlueCore4-ROM Universal Asynchronous Receiver Transmitter (UART) interface provides a simple mechanism
for communicating with other serial devices using the RS232 standard⁽¹⁾.
BlueCore4-ROM
UART_TX
UART_RX
UART_RTS
UART_CTS
Figure 10.11: Universal Asynchronous Receiver
Four signals are used to implement the UART function, as shown in Figure 10.11. When BlueCore4-ROM 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. All UART connections are implemented using CMOS technology and have
signalling levels of 0V and VDD_USB.
UART configuration parameters, such as Baud rate and packet format, are set using BlueCore4-ROM software.
Notes:
In order to communicate with the UART at its maximum data rate using a standard PC, an accelerated serial
port adapter card is required for the PC.
(1) _{Uses RS232 protocol but voltage levels are 0V to VDD_USB, (requires external RS232 transceiver}
chip)
Parameter
Possible Values
Baud Rate
Flow Control
Parity
Number of Stop Bits
Bits per channel
Minimum
Maximum
1200 Baud (≤2%Error)
9600 Baud (≤1%Error)
1.5Mbaud (≤1%Error)
RTS/CTS or None
None, Odd or Even
1 or 2
8
Table 10.5: Possible UART Settings
BC41B143A-ds-001Pe
This material is subject to CSR’s non-disclosure agreement
Production Information
© Cambridge Silicon Radio Limited 2005
Page 63 of 102