M16C User Manual.pdf

Timer BMitsubishi microcomputersM16C / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTER2.3.6 Precautions for Timer B (timer mode, event counter mode)(1) To clear reset, the count start flag is set to “0”. Set a value in the timer Bi register, then set theflag to “1”.(2) Reading the timer Bi register while a count is in progress allows reading, with arbitrary timing,the value of the counter. Reading the timer Bi register with the reload timing shown in Figure2.3.12 gets “FFFF16”. Reading the timer Bi register after setting a value in the timer Bi registerwith a count halted but before the counter starts counting gets a proper value.ReloadCounter value (Hex.)2 1 0 n n – 1Read value (Hex.)2 1 0 FFFF n – 1n = reload register contentTimeFigure 2.3.12. Reading timer Bi register324