参数资料
型号: ST72F324K2
英文描述: 8-BIT MCU WITH NESTED INTERRUPTS. FLASH. 10-BIT ADC. 4 TIMERS. SPI. SCI INTERFACE
中文描述: 8位微控制器嵌套中断。闪光。 10位ADC。 4定时器。的SPI。 SCI接口
文件页数: 33/161页
文件大小: 2070K
代理商: ST72F324K2
ST72324
128/161
CLOCK CHARACTERISTICS (Cont’d)
12.5.5 Clock Security System (CSS)
Note:
1. Data based on characterization results.
12.5.6 PLL Characteristics
Operating conditions: VDD 3.8 to 5.5V @ TA 0 to 70°C
1) or V
DD 4.5 to 5.5V @ TA -40 to 125°C
Note:
1. Data characterized but not tested.
Figure 69. PLL Jitter vs. Signal frequency1
The user must take the PLL jitter into account in
the application (for example in serial communica-
tion 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 69 shows the PLL jitter integrated on appli-
cation signals in the range 125kHz to 2MHz. At fre-
quencies of less than 125KHz, the jitter is negligi-
ble.
Note 1: Measurement conditions: fCPU = 4MHz, TA= 25°C
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fSFOSC
Safe Oscillator Frequency 1)
3
MHz
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
VDD(PLL)
PLL Operating Range
TA 0 to 70°C
3.8
5.5
V
TA -40 to +125°C
4.5
5.5
fOSC
PLL input frequency range
2
4
MHz
f
CPU/ fCPU
Instantaneous PLL jitter 1)
fOSC = 4 MHz.
1.0
2.5
%
fOSC = 2 MHz.
2.5
4.0
%
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)
+
/-Ji
tt
e
r(%
)
PLL ON
PLL OFF
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