ST72325 datasheet(154/196 Pages) STMICROELECTRONICS

Part #	ST72325

Description	8-bit MCU with 16 to 60K Flash/ROM, ADC, CSS, 5 timers, SPI, SCI, I2C interface

PDF	196 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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CLOCK CHARACTERISTICS (Cont’d)

12.5.5 Clock Security System (CSS)

Note:

1. Data based on characterization results.

12.5.6 PLL Characteristics

Note:

1. Data characterized but not tested.

The user must take the PLL jitter into account in the application (for example in serial communication or

sampling of high frequency signals). The PLL jitter is a periodic effect, which is integrated over several

CPU cycles. Therefore the longer the period of the application signal, the less it will be impacted by the

PLL jitter.

Figure 79 shows the PLL jitter integrated on application signals in the range 125kHz to 4MHz. At frequen-

cies of less than 125KHz, the jitter is negligible.

Figure 79. Integrated PLL Jitter vs signal frequency1

Note 1: Measurement conditions: fCPU = 8MHz.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fSFOSC

Safe Oscillator Frequency 1)

3MHz

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fOSC

PLL input frequency range

MHz

∆ fCPU/ fCPU Instantaneous PLL jitter 1)

fOSC = 4 MHz.

0.7

0.2

0.4

0.6

0.8

1.2

4 MHz

2 MHz

1 MHz 500 kHz 250 kHz 125 kHz

Application Frequency

+/-Jitter (%)

Max

Typ

ST72325 Datasheet(PDF) 154 Page - STMicroelectronics

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