M32C8A Datasheet, PDF (182/372 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M32C/80 Series

M32C/8A Group
15. Timers (Timer A)
Count starts
End of 1 cycle ^{Count stops}
Count source
Signal applied “H”
to TAiIN pin
“L”
TAiS bit in the
1
TABSR register
0
Set to 1 by program
1 / fj x (m+1) x (2⁸-1)
Set to 0 by program
Underflow signal of
8-bit prescaler
PWM pulse output ^{“H”}
from TAiOUT pin _{“L”}
1 / fj x (m+1) x n
IR bit in the
TAiIC register
Set to 0 by an interrupt request acknowledgement or by program
1
0
i = 0 to 4
fj: Count source frequency (f1, f8, f2n⁽¹⁾, fC32)
n: high-order bits in the TAi register (00h to FEh)
m: low-order bits in the TAi register (00h to FFh)
When the TAiS bit is set to 0 (count stops) while the TAiOUT
output is "H", the TAiOUT output becomes "L" and the IR bit
becomes 1 (interrupt requested).
(Conditions) High-order bits in the TAi register are set to 02h.
Low-order bits in the TAi register are set to 02h.
TAiMR register: The MR1 bit is set to 0 (falling edge of signal applied to the TAiIN pin.)
NOTES:
1. Bits CNT3 to CNT0 in the TCSPR register select no division (n = 0) or divide-by-2n (n = 1 to 15).
2. The 8-bit pulse width modulator counts underflow signals of the 8-bit prescaler.
Figure 15.20 8-bit Pulse Width Modulator Operation (Timer A)
Rev.1.00 Jul 15, 2007 Page 165 of 352
REJ09B0385-0100