Programming Model
MOTOROLA
Bluetooth Accelerator (BTA)
16-57
16.5.6 Correlator Registers
Five addresses pertain to correlator functions. The Threshold Register and Correlation Max Register are
write and read registers associated with one address.
16.5.6.1 Threshold Register
The write-only Threshold Register determines when an access code is considered valid. When the radio
receives a message, the BTA calculates the correlation between the access word written to the appropriate
Synch Word X Register (see Synch Word 0 Register (Write)) and the bits in the received message. When
the correlation value exceeds the value in the Threshold Register, the access code is considered valid.
The correlation depends on the signal strength and the access code. The values written to the Threshold
Register determine the signal energy level and the threshold required to accept the access word. The signal
levels and threshold values are functions of the values written to the Threshold Register. Reading address
0x0021606C returns the Correlation Max Register (see section 16.5.6.2).
The Threshold Register bits, when used with the MC13180 radio, are explained in Table 16-40. The
Threshold Register bits, when used with the SiliconWave radio, are explained in Table 16-41.
THRESHOLD
Threshold Register (MC13180)
Addr
0x0021606C
BIT
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
TYPE
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
r
RESET
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0x0000
BIT
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
THRESHOLD_II
(MC13180)
THRESHOLD_I (MC13180)
THRESHOLD (SiliconWave)
TYPE
r
r
r
r
r
r
r
w
w
w
w
w
w
w
w
w
RESET
0
0
0
0
0
0
0
1
1
1
0
0
0
0
1
0
0x01C2
Table 16-40. Threshold Register Description (MC13180)
Name
Description
Settings
Reserved
Bits 31–8
Reserved—These bits are reserved and should read 0.
THRESHOLD_II
Bits 7–4
Signal Energy
—Sets the clipping level for the access code
correlation.
Default setting is 0.5625
THRESHOLD_I
Bits 3–0
Threshold Value
—Sets the threshold value for the access code
correlation.
Default setting is 1.25
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