参数资料
型号: ST72324BLK2BA/XXX
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP32
封装: 0.400 INCH, PLASTIC, SDIP-32
文件页数: 67/151页
文件大小: 1209K
代理商: ST72324BLK2BA/XXX
ST72F324L, ST72324BL
22/151
6 SUPPLY, RESET AND CLOCK MANAGEMENT
The device includes a range of utility features for
securing the application in critical situations (for
example in case of a power brown-out), and re-
ducing the number of external components. An
overview is shown in Figure 10.
For more details, refer to dedicated parametric
section.
Main features
Optional PLL for multiplying the frequency by 2
(not to be used with internal RC oscillator)
Reset Sequence Manager (RSM)
Multi-Oscillator Clock Management (MO)
– 5 Crystal/Ceramic resonator oscillators
– 1 Internal RC oscillator
6.1 PHASE LOCKED LOOP
If the clock frequency input to the PLL is in the
range 2 to 4 MHz, the PLL can be used to multiply
the frequency by two to obtain an fOSC2 of 4 to 8
MHz. The PLL is enabled by option byte. If the PLL
is disabled, then fOSC2 = fOSC/2.
Caution: The PLL is not recommended for appli-
cations where timing accuracy is required. See
Caution: The PLL must not be used with the inter-
nal RC oscillator.
Figure 10. Clock, Reset and Supply Block Diagram
MULTI-
OSCILLATOR
(MO)
OSC1
RESET
RESET SEQUENCE
MANAGER
(RSM)
OSC2
MAIN CLOCK
CONTROLLER
WATCHDOG
TIMER (WDG)
WITH REALTIME
CLOCK (MCC/RTC)
fOSC
fCPU
0
1
PLL OPTION BIT
PLL x 2
fOSC2
/ 2
PLL Block
1
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