| ??? 04/26/05 07:31 Read: times |
#92356 - AT89S8252 in Power Down mode |
Hello! In one of my devices, the microcontroller AT89S8252 (rev.U) is powered from power switch, which switches between battery 3,6V and main 5V supplies. I am using INT1 input (falling edge triggered) to enter the microcontroller into power down mode. The mode is entered after switching power supply off. Below is the interrupt 1 service routine:
;interrupt service IrqExt1: clr EX1 mov P1,#INIT_FOR_P1 mov P2,#INIT_FOR_P2 mov P3,#INIT_FOR_P3 orl PCON,#2 ;(I used also MOV PCON,#2 instead) ajmp $ ;interrupts initializing ... setb PT1 setb PX1 clr IT0 setb IT1 setb EX1 setb ET1 setb EA ... After switching power off, the current flowing from battery equals 12 uA, but sometimes it is 70 uA up to 120 uA! And I cannot find why. The battery supplies only AT89S8252. Does anyone have similiar problem in the past? Now I am trying to use another microcontroller to find out, if the result of current measuring will be the same. Regards, Jacek |
| Topic | Author | Date |
| AT89S8252 in Power Down mode | 01/01/70 00:00 | |
| try this | 01/01/70 00:00 | |
| maybe I solved the problem | 01/01/70 00:00 | |
| maybe | 01/01/70 00:00 | |
| ISR vs 'main' | 01/01/70 00:00 | |
| could you... | 01/01/70 00:00 | |
reasons | 01/01/70 00:00 | |
| You found same thing as me... | 01/01/70 00:00 | |
| I know you ask and wonder,,, | 01/01/70 00:00 |