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IS1002

Bluetooth Baseband Controller

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創傑科技股份有限公司

Integrated System Solution Corp.

IS1002

Bluetooth Baseband Controller

7.6 Bluetooth Clock and Internal Timers

A Bluetooth standard 28-bit counter running at 3.2 kHz implements the native clock

defined by Bluetooth specification. This clock provides the transmission and receiving

timing of a half time slot (312.5 us). Another finer counter implemented in 12 bits is also

provided as the phase of a half time slot. This phase information is very helpful when a

Bluetooth slave wants to adapt to its master’s clock. It is running at 12MHz. The counter is

pre-scalable for the purpose of power saving operations. Figure 7.6.1 describes a standard

Bluetooth native clock and master clock. The clock signal is also used as a slot boundary

signal to trigger a baseband packet transmission or receipt. See appendix A for more

information of the implementation.

Figure 7.6.1 Bluetooth Clocks

CLKN27

CLKN26

CLKN0

Ticks every 312.5 µsec

…. Native clock (free running)

CLK27

CLK26

(SlotAdjust)

CLKPhaseAdjust

CLK0

…. Clock Phase = 12 Mhz (12 bits)

….

Master clock

There are four timers provided by the system; two timers for TX/RX and general purpose

use, and the other two for general purpose use. See definition of registers for task handler

for details.

7.7 Task Handler:

The powerful pre-scheduling functions for the transceiver are realized by two sets of

programmable timers, namely Task0Slot/PhaseTimer and Task1Slot/PhaseTimer. Each

set of timers is associated with the task of transmission or receiving. When the timer is

configured by firmware, it will automatically execute the TX or RX task at a specific time.

Sub-tasks and timing for a TX task remain to be defined.

Two additional timers for general purpose use are also provided.

Preliminary Datasheet

page 9

Released date: July 2004

Revision 0.9

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