Module Descriptions
MOTOROLA
Bluetooth Accelerator (BTA)
16-5
16.3.1.2 Sequencer
The sequencer is the main controller in the Bluetooth core. The sequencer handles all timing and
synchronization of all the other BTA units. The sequencer provides control over the following units:
•
Bluetooth clocks
•
Interrupt generation
•
Top-level Bluetooth pipeline
•
Bit and frame timing
The pipeline control and bit and frame timing is handled by the Bluetooth pipeline processor, which is
discussed in Section 16.3.1.3, “Bluetooth Pipeline Processor.”
16.3.1.2.1 Bluetooth Clocks
For Bluetooth packet timing purposes, the Bluetooth core maintains two internal clocks: NativeClk and
EstimatedClk. The Bluetooth related clocks and counters maintained by the Bluetooth core are listed in
Table 16-2.
32
16
6
6
24
C
C
32
9
3
40
9
3
48
B
3
64
3
3
80
7
6, (7)
96
6
6, (7)
Table 16-2. Bluetooth Clocks and Counters
Name
Bit Size
Input Frequency
Precision
Purpose
NativeCount
12
8 MHz
High
Generate native 3.2 kHz SysTick.
EstimatedCount
12
8 MHz
High
Generate estimated 3.2 kHz SysTick of a
remote master. The count is updated each
time the access code is triggered unless a
special override bit is set.
OffsetCount
12
8 MHz
High
Difference between NativeCount and
EstimatedCount.
NativeClk
28
3.2 kHz
Low (power down)
High (operation)
Free-running native clock of the unit.
When the unit is the master of a
communication, the remote slave must
synchronize to this clock.
Table 16-1. CLK_CONTROL Register Settings for Synchronization (Continued)
BT1_CLK_IN_DIV Value
ips_clk (MHz)
BT1_WSLOT Value
BT1_RSLOT Value
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