SPC560P34L1 datasheet(17/103 Pages) STMICROELECTRONICS

17 / 103 page

SPC560P34L1, SPC560P34L3, SPC560P40L1, SPC560P40L3

Introduction

Doc ID 16100 Rev 7

17/103

1.5.8

System clocks and clock generation

The following list summarizes the system clock and clock generation on the

SPC560P34/SPC560P40:

●

Lock detect circuitry continuously monitors lock status

●

Loss of clock (LOC) detection for PLL outputs

●

Programmable output clock divider (

÷1, ÷2, ÷4, ÷8)

●

FlexPWM module and eTimer module running at the same frequency as the e200z0h

core

●

Internal 16 MHz RC oscillator for rapid start-up and safe mode: supports frequency

trimming by user application

1.5.9

Frequency-modulated phase-locked loop (FMPLL)

The FMPLL allows the user to generate high speed system clocks from a 4–40 MHz input

clock. Further, the FMPLL supports programmable frequency modulation of the system

clock. The PLL multiplication factor, output clock divider ratio are all software configurable.

The FMPLL has the following major features:

●

Input clock frequency: 4–40 MHz

●

Maximum output frequency: 64 MHz

●

Voltage controlled oscillator (VCO)—frequency 256–512 MHz

●

Reduced frequency divider (RFD) for reduced frequency operation without forcing the

FMPLL to relock

●

Frequency-modulated PLL

–

Modulation enabled/disabled through software

–

Triangle wave modulation

●

Programmable modulation depth (±0.25% to ±4% deviation from center frequency):

programmable modulation frequency dependent on reference frequency

●

Self-clocked mode (SCM) operation

1.5.10

Main oscillator

The main oscillator provides these features:

●

Input frequency range: 4–40 MHz

●

Crystal input mode or oscillator input mode

●

PLL reference

1.5.11

Internal RC oscillator

This device has an RC ladder phase-shift oscillator. The architecture uses constant current

charging of a capacitor. The voltage at the capacitor is compared by the stable bandgap

reference voltage.

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