參數(shù)資料
型號(hào): HMS38112
廠商: Electronic Theatre Controls, Inc.
英文描述: 4-BIT SINGLE CHIP MICROCOMPUTERS
中文描述: 4位單片機(jī)微機(jī)
文件頁(yè)數(shù): 35/73頁(yè)
文件大?。?/td> 505K
代理商: HMS38112
3-7
Reset Operation
HMS38112/39112 have three reset sources. One is a built-in Power-on reset circuit, another
is a built-in Low VDD Detection circuit, the other is the overflow of Watch Dog Timer
(WDT). All reset operations are internal in the HMS38112.
Built-in Power On Reset Circuit
HMS38112/39112 has a built-in Power-on reset circuit consisting of an about
1
D
Resistor and a 3pF Capacitor. When the Power-on reset pulse occurs,
system reset signal is latched and WDT is cleared. After the overflow time of WDT
(2
13
x System clock time), system reset signal is released.
Chapter 3. Architecture
t
reset
VCC
System
RESETB
About 108msec at
fosc = 3.64MHz
VDD
GND
Counter
(WDT)
System
RESETB
1
D
3pF
<HMS38/39XXX>
Fig. 3-4 Power-On Reset Circuit and Timing Chart
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