SX1441EVK Semtech, SX1441EVK Datasheet - Page 21

• Manufacturer Part Number: SX1441EVK
• Description: KIT DEV FOR SX1441
• Manufacturer: Semtech
• Series: EasyBlue™r
• Type: Bluetoothr

Specifications of SX1441EVK

• For Use With/related Products: SX1441
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Contents: -
• Other names: SX1441DVK; SX1441DVK

Personal Area Network
Switching from one clock to one other and stopping the unused clock must be performed in three MOVE
instructions to RegSysClock. First enable the new clock, then select the CPU clock, and finally stop the unused
clock. Combining the different operations in one instruction may cause system malfunction.
3.5.7 RegSysMisc Description
When OutputCk32kHz is 1, the ck32kHz clock is output of the port B PB[3]. The CPU clock is output on the port B
PB[2] when the bit OutputCkCpu is 1.
3.5.8 Prescalers
The Figure 11 describes the overall structure of the prescaler.
© Semtech 2006
SlwClock
SlwClock
SysClock
SysClock
SlwClock
Mode
name
RC
RC
+
+
Clock Sources
0
0
0
1
1
0
1
1
0
0
1
0
1
0
1
1
0
1
0
1
SLW_CLOCK_IN
SYS_CLOCK_IN
SYS_CLOCK_IN
Table 22 – SX1441 Clock configuration
CpuSel = 0
ckRC
ckRC
CpuCk
21
SLW_CLOCK_IN
SLW_CLOCK_IN
SLW_CLOCK_IN
high prescaler
high prescaler
CpuSel = 1
output
output
Clock Targets
SYS_CLOCK_IN
SYS_CLOCK_IN
High prescaler
clock input
SX1441 – Bluetooth® 1.2 SoC
ckRC
ckRC
Off
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SLW_CLOCK_IN
SLW_CLOCK_IN
Low prescaler
high prescaler
high prescaler
clock input
Data Sheet
output
output
On