Module Descriptions
MOTOROLA
Bluetooth Accelerator (BTA)
16-13
16.3.1.6 Bluetooth Application Timer
The Bluetooth core includes a 12-bit Bluetooth Application Timer (BAT) that can be configured to
generate periodic interrupts. The BAT is programmable via the Bluetooth Application Timer Register
(BAT). When the software writes a value to the BAT register, the timer is initialized to this value.
The BAT is clocked with the 8 MHz clock and is decremented by one at each clock tick. When the timer
expires, a “BTtim” interrupt is generated and the counter is automatically reloaded with the value written
to the BAT register.
The “BTtim” interrupt can be masked via the ENABLE bit of the BAT register.
16.3.1.7 Hop Selection Co-Processor
The frequency selection scheme of the Bluetooth system consists of two parts:
•
Sequence Selection
•
Mapping of this sequence on the hop frequencies and the RF module frequency synthesizer
programming
The hop selection co-processor is used to perform part of the computation that selects the hop frequency
according to the Bluetooth specifications. Software must complete the addition of
F
(specified in the
Bluetooth specifications) and must also perform the modulo operation.
The selection is initiated by writing to the
HOP0 to HOP4
registers. Once the selection has been initiated,
software can read the result back from the HOP_FREQ_OUT register. The software must then complete
the sequence selection computation and map the selected channel to RF module frequency synthesizer
programming parameters.
The sequence to be written into the co-processor is as shown in Table 16-7.
16.3.1.8 Radio Control
The radio interface supports two RF front ends:
•
Motorola Radio, MC13180, SPI Interface
•
SiliconWave Radio, SiW1502, SPI Interface
The selection of the used interface is determined via software by writing to the RF_CONTROL register.
Table 16-8 on page 16-14 describes the interface of the Bluetooth pins to each of the RF front ends. Some
pins are configurable as inputs and outputs, depending on which radio module is used. The reset values are
shown for the output configurations.
Table 16-7. Hop Selection Co-Processor Writing Sequence
Register Description
Register Name
Bits
Notes
Hop 0 (Frequency In) Register
HOP0
CLK_LOW
CLK
15-0
of the used clock
Hop 1 (Frequency In) Register
HOP1
CLK_HIGH
CLK
25-16
of the used clock
Hop 2 (Frequency In) Register
HOP2
LAPUAP_LOW
LAP
15-0
Hop 3 (Frequency In) Register
HOP3
LAPUAP_HIGH
{UAP
3-0
, LAP
23-16
}
Hop 4 (Frequency In) Register
HOP4
SYS, STATE
See Section 16.5.11.5, “Hop 4 (Frequency
In) Register,” on page 16-84
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