User's Manual

Enhanced Class 1 Bluetooth v2.1 Module
User’s Guide
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CONN-GUIDE-BT740_v0.2
6.2 Special S Registers (240 to 255)
Registers 240 to 255 inclusive are special in the sense that when written, the value automatically commits
to non-volatile memory.
Table 6-2: Special S registers
RegNo
Dec
(Hex)
Min
Max
Category
Description
240
(F0)
0
921600
UART
Comms
UART Baudrate
Writing 0 implies default baudrate which may be different for all
the different protocols as follows:
MP mode = 115200
AT mode = 9600
Automatically saves to non-volatile memory on write.
241
(F1)
1
1
UART
Comms
UART Handshaking.
1=CTS/RTS
Automatically saves to non- volatile memory on write.
242
(F2)
1
2
UART
Comms
UART Stopbits
Automatically saves to non- volatile memory on write.
243
(F3)
0
2
UART
Comms
UART Parity
0=None
1=Odd
2=Even
Automatically saved to non- volatile memory on write
255
(FF)
0
2
Protocol
Mode
Host Communications Protocol
0 = Select protocol based on the state of GPIO input pin.
1 = Multipoint Packet Protocol
2 = AT Protocol
If this register contains 0, then at least one S register in the
range 50 to 65 should be set to the value (14 =
PROTOCOL_MODE_IN) so that the GPIO pin corresponding to
that S Register automatically configures as an input and if on
power up, the state of that pin is 0, then AT protocol activates,
oitherwise MP.
If no GPIO pin is configured to specify protocol and the value in
this register is 0, then MP Protocol is selected.
Automatically saves to non-volatile memory on write.
All these S Registers, unless specifically mentioned, become effective after a power cycle or reset.