455A Datasheet, PDF (40/148 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

455A Group
• CNTR output auto-control circuit operation example 1 (W23 = “1”, W41 = “1”)
PWM signal
Timer 1 underflow signal
CNTR output
Timer 1 start
CNTR output start
* When the CNTR1 output auto-control circuit is selected, valid/invalid of CNTR output is repeated every timer 1 underflows.
• CNTR output auto-control circuit operation example 2 (W23 = “1”, W41 = “1”)
PWM signal
Timer 1 underflow signal
Register W41
Timer 1 start
(1)
(2)
CNTR output
CNTR output start
(1) When the CNTR output auto-control function is not selected while the CNTR output is invalid,
CNTR output invalid state is retained.
(2) When the CNTR output auto-control function is not selected while the CNTR output is valid,
CNTR output valid state is retained.
(3) When the timer 1 is stopped, the CNTR output auto-control function becomes invalid.
Fig 38. CNTR output auto-control function by timer 1
Timer 1 stop
(3)
CNTR output stop
Rev.1.01 Feb 15, 2008 Page 40 of 146
REJ03B0224-0101