System Considerations
MKW01xxRM Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc.
4-9
NOTE
•
The initial frequency tolerance (cut tolerance), temperature stability and
aging performance should be chosen in accordance with the target
operating temperature range and the receiver bandwidth selected.
•
The loading capacitance should be applied externally, and adapted to the
actual C
load
specification of the crystal.
•
A minimum crystal frequency of 28 MHz is required to cover the
863-870 MHz band and 29 MHz for the 902-928 MHz band.
4.4.2.2
Transceiver ClkOut Output (DIO5)
The reference frequency, or a fraction of it, can be provided as an output on DIO5. Use of the ClkOut
output allows:
•
Driving the clock source to the MCU -
— Saves the cost of an additional crystal.
— ClkOut can be made available in any operation mode except Sleep mode and is automatically
enabled at power-on reset.
•
Trimming of the reference oscillator frequency - ClkOut can be provided as a test point for a
frequency counter to allow trimming of the external load capacitance during design/evaluation.
The ClkOut functionality is controlled by programming transceiver Register RegDioMapping2 (0x26)
(see
Section 7.10, “IRQ and Pin Mapping Registers”
):
•
Bits 5:4 - control the function of DIO5 and enable ClkOut. See Table 7-2 and Table 7-3.
•
Bits 2:0 - control the ClkOut frequency.
Table 4-3 lists ClkOut frequency versus Bits 2:0 setting using a 32 MHz reference source.
Table 4-3. ClkOut Frequency Using 32 MHz Reference Oscillator
ClkOut
Bits 2:0
Divide
Ratio
ClkOut Frequency
(MHz)
000
1
32
001
1/2
16
010
1/4
8
011
1/8
4
100
1/16
2
101
1/32
1
110
RC
62.5 kHz
(Automatically enabled)
111
-
OFF
Содержание MKW01Z128
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