there are two timer/counter | Microcontroller › 8051 › AT89C External timer inputs do not work as regular inputs › there are two timer/counter May 15, 2014 at 3:47 pm #11732 Ashutosh BhattParticipant there are two timer/counter in 8051 at a time it can work as timer or counter if T0 you are configuring as timer. it will count internal pulses at 1 MHz else if you are configurating T0 as counter it will count external pulses (max at 1 MHz) similar for T1. no need to configure anything else.
