4509 Datasheet, PDF (35/142 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4509 Group
q Timer 2 count start timing (R2L = “0216”, R2H = ”0216”, W23 = “1”)
Machine cycle
Timer 2 count source
(System clock (STCK))
Register W22
Timer 2 count value
(Reload register)
Timer 2 undeflow signal
PWM2 signal
Mi
Mi + 1
Mi + 2
TW2A instruction execution (W22←“1”)
Mi + 3
0216
(R2L)
0116
0016
0216
(R2H)
0116
0016
0216
(R2L)
Timer 2 count start timing
q Timer 2 count stop timing (R2L = “0216”, R2H = ”0216”, W23 = “1”)
Machine cycle
Timer 2 count source
(System clock (STCK))
Register W22
Timer 2 count value
(Reload register)
Timer 2 undeflow signal
PWM2 signal
Mi
Mi + 1
Mi + 2
Mi + 3
TW2A instruction execution (W22←“0”)
0216
(R2H)
0116
0016
0216
(R2L)
0116
0016
(R2H)
0216
(Note 1)
Timer 2 count stop timing
Notes 1: If the timer count stop timing and the timer underflow timing overlap while the PWM function is valid (W13=“1” or W23=“1”),
a hazard may occur in the PWM signal waveform.
2: When timer count is stopped during “H” duration of the PWM signal, timer is stopped after the end of the “H” output duration.
Fig. 27 Timer count start/stop timing
Rev.1.02 2006.12.22 page 35 of 140
REJ03B0147-0102