參數(shù)資料
型號: ST92186B3BK
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 16-BIT, MROM, 24 MHz, MICROCONTROLLER, PDIP32
封裝: PLASTIC, SDIP-32
文件頁數(shù): 102/148頁
文件大小: 1664K
代理商: ST92186B3BK
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ST92186B - RESET AND CLOCK CONTROL UNIT (RCCU)
4.3 OSCILLATOR CHARACTERISTICS
Because of the real time need of the application, it
is assumed the ST92186B will be used with a 4
MHz crystal fed to the Core by the frequency mul-
tiplier output after it is started and stabilized.
4.3.1 HALT State
When a HALT instruction is processed, it stops the
main crystal oscillator preventing any derived
clock into the chip. Exit from the HALT state can
be obtained through a main system reset.
It should be noted that, if the Watchdog function is
enabled, a HALT instruction will not disable the os-
cillator. This to avoid stopping the Watchdog if a
HALT
code is executed in error. When this occurs,
the CPU will be reset when the Watchdog times
out or when an external reset is applied.
Figure 27. Crystal Oscillator
Table 13. Crystal Specification
Legend:
CL1, CL2: Maximum Total Capacitances on pins OSCIN
and OSCOUT (the value includes the external capaci-
tance tied to the pin CL1 and CL2 plus the parasitic capac-
itance of the board and of the device).
Note: The tables are relative to the fundamental quartz
crystal only (not ceramic resonator).
Figure 28. Internal Oscillator Schematic
OSCIN
OSCOUT
CL1
CL2
ST9
CRYSTAL CLOCK
VR02116A
1M*
*Recommended for oscillator stability
C1=C2=56pF
C1=C2=47pF
Rs max (ohm)
200
260
VR02086A
HALT
OSCIN
OSCOUT
RIN
ROUT
R
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