External Crystal / Resonator Connections - NXP Semiconductors freescale KV4 Series Reference Manual

Refer to signal multiplexing information for this MCU for more details.
Signal Description
EXTAL External clock/Oscillator input
XTAL Oscillator output

29.5 External Crystal / Resonator Connections

The connections for a crystal/resonator frequency reference are shown in the figures
found here.
When using low-frequency, low-power mode, the only external component is the crystal
or ceramic resonator itself. In the other oscillator modes, load capacitors (C
feedback resistor (R
F
Table 29-2. External Caystal/Resonator Connections
Low-frequency (32 kHz), low-power
Low-frequency (32 kHz), high-gain
High-frequency (3~32 MHz), low-power
High-frequency (3~32 MHz), high-gain
1. With the low-power mode, the oscillator has the internal feedback resistor R
externally with the Connection 3.
2. When the load capacitors (Cx, Cy) are greater than 30 pF, use Connection 3.
Figure 29-2. Crystal/Ceramic Resonator Connections - Connection 1
Freescale Semiconductor, Inc.
Table 29-1. OSC Signal Descriptions
) are required. The following table shows all possible connections.
Oscillator Mode
XTAL
Crystal or Resonator
KV4x Reference Manual, Rev. 2, 02/2015
Preliminary
. Therefore, the feedback resistor must not be
F
OSC
V EXTAL
SS
Chapter 29 Oscillator (OSC)
I/O
I
O
, C ) and
x y
Connections
1
Connection 1
2
Connection 2/Connection 3
1
Connection 3
Connection 3
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