參數(shù)資料
型號(hào)： C508
廠商： INFINEON TECHNOLOGIES AG
元件分類： 8位微控制器
英文描述： 8-Bit CMOS Microcontroller
中文描述： 8位CMOS微控制器
文件頁數(shù)： 19/93頁
文件大小： 1204K
代理商： C508
C508
Data Sheet
15
2000-08
Reset and System Clock Operation
The reset input is an active high input. Since the reset is synchronized internally, the
RESET pin must be held high for at least two machine cycles (6 oscillator periods) while
the oscillator is running. During reset, pins ALE and PSEN are configured as inputs and
should not be stimulated externally. (External stimulation at these lines during reset
activates several reserved test modes. This, in turn, may cause unpredictable output
operations at several port pins).
At the reset pin, a pull-down resistor is internally connected to
V
SS
to allow a power-up
reset with an external capacitor only. An automatic power-up reset can be obtained,
when
V
DD
is applied, by connecting the reset pin to
V
DD
via a capacitor. After
V
DD
has
been turned on, the capacitor must hold the voltage level at the reset pin for a specific
time to effect a complete reset.
The time required for a reset operation includes the oscillator start-up time, the PLL lock
time and the time for 2 machine cycles, which must be at least 10 - 20 ms, under normal
conditions. This requirement is typically met using a capacitor of 4.7 to 10
μ
F. The same
considerations apply if the reset signal is generated externally. In each case, it must be
assured that the oscillator has started up properly and that at least two machine cycles
have passed before the reset signal goes inactive.
Figure 7
shows the possible reset
circuitries.
Figure 7
Reset Circuitries
MCS04030
C508
RESET
V
DD
+
C508
RESET
C508
RESET
&
+
V
DD
a)
b)
c)
相關(guān)PDF資料
PDF描述
C508 Previous Vectron Model Numbers
C509-L 8-Bit CMOS Microcontroller
C509-L 8-Bit CMOS Microcontroller
C513A-2RM 8-Bit CMOS Microcontroller
C513A-HN 8-Bit CMOS Microcontroller
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