User's Manual

Class 1 Bluetooth v2.0 Module
User’s Guide
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33
CONN-GUIDE-BT730_v0.9
Reg.
#
Defaul
t
Range
Comment
S553
0x020
1
0x0FFF
This register specifies in each 4 bit nibble, how the DTR,DCD,RI
output pins are controlled when NOT in a Bluetooth connection
Nibble 0..3 specifies the source for DTR
4..7 specifies the source for DCD
8..11 specifies the source for RI
In addition it also refers to S Register 552 to see if the relevant pin is
an input or not to be touched. If the nibble in 552 is 0, then the
relevant pin is an input.
Each nibble can take the following value:
 0 – Always deassert
 1 – Always assert
 2 – Assert if RING is being sent to the host
The default for the Universal RS-232 Adaptor is $0200.
S554
0
0..900
If S Register 512 >/=2 and </=7 then this register specifies a time in
seconds for which the device stays in the S512 mode after power up
or reset. On timeout, it aborts the discoverable and/or connectable
and falls back into S512=1 mode, when it is deaf and dumb.
Note: If AT+BTR has been used to specify a peer device, then on
reverting to mode 1, it attempts to make a connection to that
peer device.
A power cycle, reset via BREAK or ATZ is required to see the effects
of change.
S555
1
1..7
If S Register 554 is nonzero, then after the post reset window expires,
the mode reverts to the mode specified in this register. This allows,
for example, the device to be discoverable and connectable on power
up (mode 4 or 7) and on window timer expiry to revert to connectable
only (mode 3 or 6).
A power cycle, reset via BREAK or ATZ is required to see effects of a
change.
In some firmware builds, S Registers 565 to 569 (inclusive) are
visible, which allows the start-up mode to depend on the state of RI
line (Setting S Reg 565 forces the RI pin to be configured as an
input). For this feature to be active, S Reg 565 should be set to 1. In
that case, on start-up, if RI is asserted, then the start-up mode is
defined by S Reg 568 and if deasserted then S Reg 569.
S556
0
0..3
Allows GPIO or ADC values to be read via the minor class field in an
inquiry response.
When this value is non-zero, bits2 to 7 contain information as follow:
 1 – ADC1
 2 – ADC2
 3 – GPIO1 to GPIO6
Set to 0 to disable this feature.
This allows i/o information to be conveyed without a connection.