M32C8A Datasheet, PDF (359/372 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 Series

M32C/8A Group
24. Usage Notes
24.7 Timers
24.7.1 Timer A, Timer B
Timers are stopped after reset. Set the TAiS (i = 0 to 4) or TBjS (j = 0 to 5) bit in the TABSR or TBSR register
to 1 (count starts) after setting timer operating mode, count source, and counter value.
The following registers and bits must be changed while the TAiS or TBjS bit is set to 0 (count stops).
• Registers TAiMR and TBjMR
• UDF register
• Bits TAZIE, TA0TGL, and TA0TGH in the ONSF register
• TRGSR register
24.7.2 Timer A
24.7.2.1 Timer A (Timer Mode)
• The TAiS bit (i = 0 to 4) in the TABSR register is set to 0 (count stops) after reset. Set the TAiS bit to 1
(count starts) after selecting timer operating mode and setting the TAi register.
• The TAi register indicates a counter value while counting at any given time. However, FFFFh can be read
in the reload timing. A setting value can be read between when the TAi register is set while a counter stops
and when a counter is started.
24.7.2.2 Timer A (Event Counter Mode)
• The TAiS bit (i = 0 to 4) is set to 0 (count stops) after reset. Set the TAiS bit to 1 (count starts) after
selecting timer operating mode and setting the TAi register.
• The TAi register indicates a counter value while counting at any given time. However, FFFFh can be read
if the timer underflows or 0000h if the timer overflows, in the reload timing. A setting value can be read
between setting the TAi register while a counter stops and starting a counter.
Rev.1.00 Jul 15, 2007 Page 342 of 352
REJ09B0385-0100