4552 Datasheet, PDF (38/145 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4552 Group
CNTR output auto-control circuit by timer 1 is selected.
q CNTR output: valid (W23 = “1”)
CNTR output auto-control circuit selected (W41 = “1”)
PWM
signal
Timer 1 underflow signal
CNTR output
Timer 1 start
CNTR output start
q CNTR output auto-control function
PWM
signal
Timer 1 underflow signal
Timer 1 start
➀
➁
Timer 1
stop
Register W41
➂
CNTR output
CNTR output start
CNTR output stop
➀ ^{When the CNTR output auto-control function is set to be invalid while the CNTR output is invalid,}
the CNTR output invalid state is retained.
➁ ^{When the CNTR output auto-control function is set to be invalid while the CNTR output is valid,}
the CNTR output valid state is retained.
➂ When timer 1 is stopped, the CNTR output auto-control function becomes invalid.
Note: When the PWM signal is output from C/CNTR pin, set the output latch of port C to “0”.
Fig. 27 CNTR output auto-control function by timer 1
Rev.3.02 Dec 22, 2006 page 38 of 142
REJ03B0023-0302