4571 Datasheet, PDF (35/126 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4571 Group
• CNTR1 output auto-control circuit operation example 1 (W33 = “1”, W51 = “1”)
PWM signal
Timer 1 underflow signal
CNTR1 output
Timer 1 start
CNTR1 output start
* When the CNTR1 output auto-control circuit is selected, valid/invalid of CNTR1 output is repeated every timer 1 underflows.
• CNTR1 output auto-control circuit operation example 2 (W33 = “1”, W51 = “1”)
PWM signal
Timer 1 underflow signal
Register W51
Timer 1 start
(1)
(2)
CNTR1 output
CNTR1 output start
(1) When the CNTR1 output auto-control function is not selected while the CNTR1 output is invalid,
CNTR1 output invalid state is retained.
(2) When the CNTR1 output auto-control function is not selected while the CNTR1 output is valid,
CNTR1 output valid state is retained.
(3) When the timer 1 is stopped, the CNTR1 output auto-control function becomes invalid.
Fig 35. CNTR1 output auto-control function by timer 1
Timer 1 stop
(3)
CNTR1 output stop
Rev.1.02 May 25, 2007 Page 35 of 124
REJ03B0179-0102