ST72325 STMICROELECTRONICS [STMicroelectronics], ST72325 Datasheet - Page 153

• Manufacturer Part Number: ST72325
• Description: 8-BIT MCU WITH 16 TO 60K FLASH/ROM, ADC, CSS, FIVE TIMERS, SPI, SCI, I2C INTERFACE
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

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 78
cies of less than 125KHz, the jitter is negligible.
Figure 78. Integrated PLL Jitter vs signal frequency
Note 1: Measurement conditions: f
+/-Jitter (%)
f
f
∆ f
SFOSC
OSC
Symbol
Symbol
CPU
1.2
0.8
0.6
0.4
0.2
/ f
1
0
CPU
shows the PLL jitter integrated on application signals in the range 125kHz to 4MHz. At frequen-
4 MHz
Safe Oscillator Frequency
PLL input frequency range
Instantaneous PLL jitter
2 MHz
Parameter
Parameter
Application Frequency
1 MHz 500 kHz 250 kHz 125 kHz
1)
1)
CPU
= 8MHz.
f
OSC
= 4 MHz.
Max
Typ
Conditions
Conditions
1
Min
Min
2
Typ
Typ
0.7
3
Max
Max
4
2
ST72325
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MHz
Unit
MHz
Unit
%