228CHAPTER 9 8-BIT TIMER/EVENT COUNTERSTI1 Pin InputTM1 Count ValueINTTM1CR1000 01 02 03 04 05 N-1 N 00 01 02 03N(2) External event counter operationThe external event counter counts the number of external clock pulses to be input to the TI1/P33 and TI2/P34 pins with 8-bit timer registers 1 and 2 (TM1 and TM2).TM1 and TM2 are incremented each time the valid edge specified with the timer clock select register (TCL1)is input. Either the rising or falling edge can be selected.When the TM1 and TM2 counted values match the values of 8-bit compare registers (CR10 and CR20), TM1and TM2 are cleared to 0 and the interrupt request signals (INTTM1 and INTTM2) are generated.Figure 9-9. External Event Counter Operation Timings (with Rising Edge Specified)Remark N = 00H to FFH
