4571 Datasheet, PDF (36/126 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4571 Group
Timer 3 count start timing (R3L = “0216”, R3H = “0216”, W33 = “1”)
Machine cycle
Timer 3 count source
(XIN input)
Register W31
Timer 3 count value
(reload register)
Timer 3 underflow signal
PWM signal
Mi
Mi + 1
TW3A instruction execution (W31←1)
Mi + 2
Mi + 3
0216
(R3L)
0116
0016
0216 0116
(R3H)
0016
0216
(R3L)
Timer 3 count start timing
Timer 3 count stop timing (R3L = “0216”, R3H = “0216”, W33 = “1”)
Machine cycle
Timer 3 count source
(XIN input)
Register W31
Timer 3 count value
(reload register)
Timer 3 underflow signal
Mi
Mi + 1
Mi + 2
Mi + 3
TW3A instruction execution (W31←0)
0216 0116
(R3H)
0016
0216 0116
(R3L)
0016
(R3H)
0216
PWM signal
(Note 1)
Timer 3 count stop timing
Notes 1: If the timer count stop timing and the timer underflow timing overlap while the CNTR1 pin output
is valid (W33=“1”), a hazard may occur in the PWM signal waveform.
2: When timer count is stopped during “H” interval of the PWM signal, timer is stopped after
the end of the “H” output interval.
Fig 36. Timer count start/stop timing
Rev.1.02 May 25, 2007 Page 36 of 124
REJ03B0179-0102