4559 Datasheet, PDF (40/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4559 Group
Timer 2 count start timing (R2L = “0216”, R2H = “0216”, W23 = “1”)
Machine cycle
Timer 2 count source
(XIN input)
Register W21
Timer 2 count value
(reload register)
Timer 2 underflow signal
PWM signal
Mi
Mi + 1
TW2A instruction execution (W21←1)
Mi + 2
Mi + 3
0216
(R2L)
0116
0016
0216 0116
(R2H)
0016
0216
(R2L)
Timer 2 count start timing
Timer 2 count stop timing (R2L = “0216”, R2H = “0216”, W23 = “1”)
Machine cycle
Timer 2 count source
(XIN input)
Register W21
Timer 2 count value
(reload register)
Timer 2 underflow signal
Mi
Mi + 1
Mi + 2
Mi + 3
TW2A instruction execution (W21←0)
0216 0116
(R2H)
0016
0216 0116
(R2L)
0016
(R2H)
0216
PWM signal
(Note 1)
Timer 2 count stop timing
Notes 1: If the timer count stop timing and the timer underflow timing overlap while the CNTR pin output
is valid (W23=“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 39. Timer count start/stop timing
Rev.1.04 Aug 23, 2007 Page 40 of 146
REJ03B0188-0104