sx1441 Semtech Corporation, sx1441 Datasheet - Page 27

• Manufacturer Part Number: sx1441
• Description: Bluetooth V1.2 Soc For Voice And Data Applications With Dsp Capabilities
• Manufacturer: Semtech Corporation

Personal Area Network
3.5.9 CODEC and Bluetooth Sequencer Clocks
The CODEC can only use SYS_CLOCK_IN since it needs exactly a 13 MHz frequency to meet the Bluetooth audio
specifications. The Bluetooth sequencer uses SYS_CLOCK_IN for normal operations and SLW_CLOCK_IN during
the low power modes.
In a typical application where the SX1441 is used with its companion chip, the XE1413 radio, SYS_CLOCK_IN and
SLW_CLOCK_IN are generated by the XE1413.
3.6
3.6.1 Features
.
3.6.2 Register Map
© Semtech 2006
Low prescaler output
ck128Hz
ck2Hz
ck1Hz
Name
RegIrqHig
RegIrqMid
RegIrqLow
RegIrqEnHig
RegIrqEnMid
RegIrqEnLow
ReqIrqPriority
ReqIrqIrq
Pos
7
6
5
4
3
• Supports 24 sources of interrupt
• Three levels of priority
INTERRUPT CONTROLLER
RegIrqHig
-
128Hz
Spi
CntA
CntC
SLW CLOCK IN
SYS_CLOCK_IN
Figure 14 – Codec and Bluetooth Sequencer clocking sources
Peripherals
interrupt controller, event controller
Watchdog
interrupt controller, event controller
r/w
r
rc1
rc1
rc1
rc1
Table 26 - Interrupt controller register map
Table 25 - Low prescaler outputs usage
Oscillator
Reset
0
0
0
0
0
RC
27
Function
Reserved
interrupt from ck128Hz low prescaler output
interrupt from SPI
interrupt from counter A
interrupt from counter C
Address (Hex)
0x0040
0x0041
0x0042
0x0043
0x0044
0x0045
0x0046
0x0047
Application
Sequencer
Processor
Bluetooth
CODEC
SX1441 – Bluetooth® 1.2 SoC
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Data Sheet