Bluetooth Pipeline Processor; Table 16-3 Bluetooth Core Interrupts - Motorola DragonBall MC9328MX1 Reference Manual

Interrupt Type
BTsys SysTick
EndOfHeader (EOH)
EndOfFrame (EOF)
BTtim BT timer
BTwui BT wakeup 2
BT wakeup 3

16.3.1.3 Bluetooth Pipeline Processor

The Bluetooth core contains a Bluetooth pipeline in which all low-level processing is handled in dedicated
hardware. The pipeline units are controlled by the sequencer, however each unit contains an additional,
small controller to perform its function independently. The units communicate via a dedicated serial wire.
The control is handled by a request/acknowledge scheme when data is available. The pipeline contains the
following four units:
• HEC/CRC generator and checker
• Encryption and decryption engine
• Whitening and de-whitening logic
• FEC coding and decoding
The four units process incoming or outgoing Bluetooth packets. Figure 16-3 shows the format of a
Bluetooth packet.
MOTOROLA
Table 16-3. Bluetooth Core Interrupts
Frequency
3.2 kHz (fixed) SysTick is the main Bluetooth heartbeat. The phrase depends
on whether the NativeClk (when unit is the master) or
EstimatedClk (when unit is the slave) is used.
800 Hz (max) EOH interrupts are issued after a header has been decoded
during receive of certain types of packets. For ID, NULL and
POLL packets, no interrupt is generated. For HVx and FHS
packets, an interrupt is generated after the packet header
(because packet length is fixed). For DMx, DHx, AUX and DV
packets, an interrupt is generated after the payload header has
been decoded. This interrupt is maskable via the COMMAND
Register.
1.6 kHz (max) Generated after any received or transmitted frame. This interrupt
is maskable via the COMMAND Register.
– User programmable Bluetooth application-specific timer.
– Interrupt that occurs during the wakeup sequence. The interrupt
is generated when the PLL is enabled and when it has stabilized.
Bluetooth Accelerator (BTA)
Module Descriptions
Description
16-7