M16C User Manual.pdf

Timer AMitsubishi microcomputersM16C / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTER2.2.13 Precautions for Timer A (timer mode)(1) To clear reset, the count start flag is set to “0”. Set a value in the timer Ai register, then set theflag to “1”.(2) Reading the timer Ai register while a count is in progress allows reading, with arbitrary timing,the value of the counter. Reading the timer Ai register with the reload timing shown in Figure2.2.28 gets “FFFF16”. Reading the timer Ai register after setting a value in the timer Ai 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 2.2.28. Reading timer Ai register308