Timers in 8051 There are two timer in 8051, Timer-0, Timer-1;--- Use of timers: To produce precise delay timing Counting the events Generating baud rate Registers associated with timer operation are: TMOD                   89h TCON                    88h TH0                        8Ch TL0                         8Ah TH1                        8Dh TL1                         8Bh Format of TMOD and TCON registers TMOD SFR (89h) Timer-1 Timer-0 D7 D6 D5 D4 D3 D2 D1 D0 Gate C’/T M1 M0 Gate C’/T M1 M0 1: COUNT only if INT1 (P3.3) input pin is high 0-count regardless of INT1 1-      Count pulses on pin T1(P3.5) 0-      Count every machine cycle 00 Mode-0; 13 bit timer 01-   Timer 16 bit 10 mode-2; 8-bit auto reload 11- Split timer mode 1: COUNT only if INT0 (P3.3) input pin is high 0-count regardless of INT0 1   Count pulses on pin T1(P3.5)  Count eevery machine cycle 00 Mode-0; 13 bit timer 01-   Timer 16 bit 10 mode-2; 8-bit auto reload 11- Split timer mode Timer Control SFR Timer Control TCON SFR  (88h) Bits D7 D6 D5 D4 D3 D2 D1 D0 Bit Address 8F 8E 8D 8C 8B 8A 89 88 Bit Name TF1 TR1 TF0 TR0 IE1 IT1 IE0 IT0 Description Timer-1