I-China Izikhonkwane ze-terminal Abahlinzeki
I-PIN isho ukuxhumana phakathi komjikelezo wangaphakathi we-Chipled Circuit (Chip) kanye nomjikelezo we-peripheral, kanti ne-PIN yakha interface ye-chip. Ngokomsebenzi, izikhonkwane ze-AT89S52 zingahlukaniswa ngezigaba ezine: Ukuhlinzekwa kwamandla amakhulu, i-osstal oscillator yangaphandle noma i-oscillator, i-multi-function I / O Port, nokulawula, i-strobe kanye nokusetha kabusha.