K60P100M100SF2RM Datasheet, PDF (575/1809 Pages) Freescale Semiconductor, Inc – K60 Sub-Family Reference Manual

Signal
EXTAL
XTAL
Table 25-1. OSC Signal Descriptions
Description
External clock/Oscillator input
Oscillator output
Chapter 25 Oscillator (OSC)
I/O
I
O
25.5 External Crystal / Resonator Connections
The connections for a crystal/resonator frequency reference are shown in the following
figures. 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_x, C_y)
and feedback resistor (R_F) are required. The following table shows all possible
connections.
Table 25-2. External Caystal/Resonator Connections
Oscillator Mode
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
Connections
Connection 1
Connection 2/Connection 3¹
Connection 1/Connection 3^2,2
Connection 2/Connection 3²
1. When the load capacitors (Cx, Cy) are greater than 30 pF, use Connection 3.
2. With the low-power mode, the oscillator has the internal feedback resistor R_F. Therefore, the feedback resistor must not be
externally with the Connection 3.
XTAL
OSC
V_SS
EXTAL
Crystal or Resonator
Figure 25-2. Crystal/Ceramic Resonator Connections - Connection 1
K60 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
575