User's Manual

Enhanced Class 1 Bluetooth v2.1 Module
User’s Guide
Americas: [phone] Option 2
Europe: [phone]
Hong Kong: [phone]
www.lairdtech.com/wireless
44
CONN-GUIDE-BT740_v0.2
RegNo
Dec
(Hex)
Min
Max
Category
Description
81
10
80
UART Comms
Memory usage in percent for MP mode UART RX
processing. Leave to default value. Only change on
advice from manufacturer.
New values round up to the nearest 10.
This register controls how many memory blocks are
reserved when the module receives a flood of UART data
packets with small payloads.
82
2
99
UART
Comms
The UART interface in the module uses hardware
RTS/CTS handshaking to ensure that the low level
receive buffer does not overflow. This register specifies at
what fill percentage the RTS output line deasserts.
This value validates to ensure it is always more than
register 83.
In AT mode, use the command ATi201 to return a
response in the format X,Y,Z, where X is the actual size
of the UART receive buffer, Y is the RTS deassert
threshold, and Z is the RTS re-assert threshold.
83
1
98
UART
Comms
The UART interface in the module uses hardware
RTS/CTS handshaking to ensure that the low level
receive buffer does not overflow. This register specifies at
what fill percentage the RTS output line reasserts.
This value validates to ensure it is always less than
register 83.
In AT mode, use the command ATi201 to return a
response in the format X,Y,Z, where X is the actual size
of the UART receive buffer, Y is the RTS deassert
threshold, and Z is the RTS re-assert threshold.
84
0
3
UART
Comms
Configure UART Latency.
The default value of 0 configures the module for maximum
throughput at the expense of latency.
Select 1 for HIGH latency ( 25 ms polling of UART RX
buffer)
Select 2 for MEDIUM latency (8 ms polling of UART RX
buffer)
Select 3 for BEST latency (1 ms polling of UART RX
buffer)
Selecting 3 has a severe detrimental impact on
throughput.
Note: Polling times are correct as of this document.
Contact Laird for updates.
128 (80)
0
0xFF
FFFF
GAP
Module’s Class of Device.
If Profiles SReg3=2 (that is only HID Profile) and SReg39
sets for 0 (I.E. built in keyboard HID descriptor), then this