BC41B143A-DS-002PD Datasheet, PDF (61/89 Pages) List of Unclassifed Manufacturers – BlueCore 4-ROM CSP EDR Single Chip Bluetooth v2.0 + EDR System

Device Terminal Descriptions
The UART interface is capable of resetting BlueCore4-ROM CSP upon reception of a break signal. A break is
identified by a continuous logic low (0V) on the UART_RX terminal, as shown in Figure 11.10. If t_BRK is longer
than the value, defined by the PS Key PSKEY_HOST_IO_UART_RESET_TIMEOUT, (0x1a4), a reset occurs.
This allows a host to initialise the system to a known state. Also, BlueCore4-ROM CSP can emit a break
character that can be used to wake the Host.
t
BRK
UART RX
Figure 11.10: Break Signal
Table 11.6 shows a list of commonly used Baud rates and their associated values for the PS Key
PSKEY_UART_BAUD_RATE (0x204). There is no requirement to use these standard values. Any Baud rate
within the supported range can be set in the PS Key according to the formula in Equation 11.9.
Baud Rate = ^{PSKEY_UART_BAUD_RATE}
0.004096
Equation 11.9: Baud Rate
Baud Rate
1200
2400
4800
9600
19200
38400
57600
76800
115200
230400
460800
921600
1382400
1843200
2764800
PSKEY_UART_BAUD_RATE Store Value
Hex
Dec
0x0005
0x000a
0x0014
0x0027
0x004f
0x009d
0x00ec
0x013b
0x01d8
0x03b0
0x075f
0x0ebf
0x161e
0x1d7e
0x2c3d
5
10
20
39
79
157
236
315
472
944
1887
3775
5662
7550
11325
Table 11.6: Standard Baud Rates
Error
1.73%
1.73%
1.73%
-0.82%
0.45%
-0.18%
0.03%
0.14%
0.03%
0.03%
-0.02%
0.00%
-0.01%
0.00%
0.00%
BC41B143A-ds-002Pd
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Production Information
© Cambridge Silicon Radio Limited 2005
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