MPC5604B/C Microcontroller Reference Manual, Rev. 8
Freescale Semiconductor 93
Chapter 6
Clock Description
This chapter describes the clock architectural implementation for MPC5604B.
6.1 Clock architecture
System clocks are generated from three sources:
• Fast external crystal oscillator 4-16 MHz (FXOSC)
• Fast internal RC oscillator 16 MHz (FIRC)
• Frequency modulated phase locked loop (FMPLL)
Additionally, there are two low power oscillators:
• Slow internal RC oscillator 128 kHz (SIRC)
• Slow external crystal oscillator 32 KHz (SXOSC)
The clock architecture is shown in Figure 6-1.
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