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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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STC89C53RC датащи(PDF) 16 Page - STCmicro Technology Co,.Ltd |
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STC89C53RC датащи(HTML) 16 Page - STCmicro Technology Co,.Ltd |
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16 / 165 page  main: MOV R3, #0 ;P1 LED increment mode changed ;start to run program main_loop: MOV A, R3 CPL A MOV P1, A ACALL delay INC R3 MOV A, R3 SUBB A, #18H JC main_loop MOV P1, #0FFH ;close all LED, MCU go into power-down mode CLR IT0 ;low electrical level trigger external interrupt 0 ; SETB IT0 ;negative edge trigger external interrupt 0 SETB EX0 ;enable external interrupt 0 CLR IT1 ;low electrical level trigger external interrupt 1 ; SETB IT1 ;negative edge trigger external interrupt 1 SETB EX1 ;enable external interrupt 1 SETB EA ;set the global enable ;if don't so, power-down mode cannot be wake up ;MCU will go into idle mode or power-down mode after the following instructions MOV PCON, #00000010B ;Set PD bit, power-down mode (PD = PCON.1) ; NOP ; NOP ; NOP ; MOV PCON, #00000001B ;Set IDL bit, idle mode (IDL = PCON.0) MOV P1, #0DFH ;1101,1111 NOP NOP NOP WAIT1: SJMP WAIT1 ;dynamically stop END 2.2 RESET Control In STC89xx series, there are 5 sources to generate internal reset. They are RESET pin, On-chip power-on-reset, Watch-Dog-Timer, software reset, and On-chip MAX810 POR timing delay. 2.2.1 Reset pin The RST pin, which is the input to Schmitt Trigger, is input pin for chip reset. A level change of RESET pin have to keep at least 24 cycles plus 10us in order for CPU internal sampling use. When this signal is brought high for at least two machine cycles plus 10 us, the internal registers are loaded with appropriate values for an orderly system start-up. For normal operation, RST is low. 16 |
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