12C887 is parallel RTC. it | Microcontroller › 8051 › DS12C887 INTERFACING WITH AT89C51 › 12C887 is parallel RTC. it March 2, 2014 at 10:48 am #11156 Ashutosh BhattParticipant 12C887 is parallel RTC. it will be very much easy to interface it with 89C51. another RTC having IIC based interfacing. somewhat complex to interface with 89C51. but if your controller is AVR or PIC then built in IIC protocol is given. so with 89C51, 12C887 is best choice
