参数资料
型号: ST72F324LK6T6
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP32
封装: 7 X 7 MM, TQFP-32
文件页数: 23/154页
文件大小: 3519K
代理商: ST72F324LK6T6
ST72324Lxx
119/154
CLOCK CHARACTERISTICS (Cont’d)
12.5.5 PLL Characteristics
Note:
1. Instantaneous PLL jitter is the absolute maximum deviation on a single clock period. Data characterized, not tested in
production.
Figure 64. PLL Clock Jitter vs. Application
Signal frequency1
PLL clock jitter may cause application errors if high
frequency signals are input or output by the appli-
cation (e.g. high speed serial I/O or sampling of
high frequency signals).
Using the PLL increases clock jitter, however this
is a periodic effect which is absorbed over several
CPU cycles. The lower the frequency of the appli-
cation signal, the less the impact.
Figure 64 shows the effect of jitter (with and with-
out PLL) on application signals in the range
125kHz to 2MHz. At frequencies of less than
125kHz, the jitter is negligible.
Note 1: Measurement conditions: fCPU = 4MHz, TA= 25°C
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VDD(PLL)
PLL Operating Range
2.85
3.6
V
fOSC
PLL input frequency range
2
4
MHz
fCPU/fCPU Instantaneous PLL jitter 1)
fOSC = 4 MHz. (fCPU=8MHz.)
3.5
5.5
%
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
2000
1000
500
250
125
Application Signal Frequency (KHz)
+
/-J
itter
(%)
FLASH
DEVICES
ROM
DEVICES
1
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