??? 04/22/10 17:12 Read: times |
#175280 - I haven't tried it yet Responding to: ???'s previous message |
Stefan Kanev said:
Did You tried 1Mohm ZCD ? It worked with PIC, but are You sure it will work with 8051? No,stefan, i haven't tried the 1Meg ZCD with 8051(89S52),i am not very sure that 89S52 has internal clamp diodes to its I/O pins (but in the Datasheet it mentions that maximum Vhigh on any I/O pin is Vcc+0.5V and Vlow is -0.5V)this 0.5V i assume is the forward Voltage drop of internal clamp diodes. but i'll take to risk of trying it out and maybe i'll have to sacrifice 1 89S52(guinea pig) and can you elaborate on the use of 16 bit timer for generatinging second Zcd pulse. Regards, Arun |