4. Reset Circuit
The reset circuit initializ
HYBRID IC BOARD
MAIN
P.W.B.
es the microcomputer program when Power is “ON” from “OFF”
Low voltage at pin resets the microcomputer, and HI activates the microcomputer
Fig. 4-1 shows the reset circuit and Fig. 4-2 shows waveform at each point when power is turned on and
off.
When power is turned on, 12V line and 5V line voltages rise and 12V line voltage reaches 10.9V an
reset voltage input to pin of microcomputer is set to Hi.
Reset voltage will be hold “Hi” until the 12V line voltage drops to 9.90V even though the power shuts
down.
Fig. 4-1
Fig. 4-2
12V line
Power is ON
Voltage (V)
Power is OFF
Voltage (V)
5V line
10.9V
Time
Time
9.9V
Reset voltage
Reset voltage
12V line
5V line
12
6
0
12
6
0
䋱䋲䌖
䌃䋲䋸䋱
䋰䌖
䌉䌃䋵䋨䋲䋯䋲䋩
䌒䋲䋸䋵
䌒䋲䋸䋲
䌃䋲䋸䋲
䌒䋲䋸䋷
䌒䋲䋸䋱
−
䋫
䋷
䋶
䋵
䋸
䇭䋵䌖
䌒䋲䋸䋶
䌒䋲䋸䋳
䌃䋲䋸䋳
䌃䋲䋸䋵
䋰䌖
䋰䌖
䌃䋲䋸䋴
䋫
䇭䇭䋰䌖
䋳䋰
䌒䋲䋲䋵
䌃䋲䋱䋱
䋵䋲
䇭䇭䇭䇭䌒䌅䌓䌅䌔
䋴䋰
䌄䋲䋷䋳
䌒䋲䋸䋸
䇭䌉 䋯䌆 䇭 䌒䌅䌌䌁䌙
䇭䌍䌉䌃䌒䌏䇭
䇭䌃䌏䌍䌐䌕䌔䌅䌒
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