4524_M Datasheet, PDF (210/310 Pages) Renesas Technology Corp – 4-BIT CISC SINGLE-CHIP MICROCOMPUTER 720 FAMILY / 4500 SERIES

4524 Group
APPLICATION
2.3 Timers
➀ Disable Interrupts (Note 1)
Timer 4 and serial I/O interrupts are temporarily disabled.
Interrupt enable flag INTE 0
Interrupt control register V2
b3
b0
0 ✕✕✕
All interrupts disabled [DI]
b3: Timer 4 and serial I/O interrupts occurrence disabled
[TV2A]
➁ Select Timer 4 Interrupt (Note 1)
Timer 4 is selected for the interrupt source.
Interrupt control register I3
↓
b0
0 Timer 4 interrupt valid [TI3A]
↓
➂ Stop Timer Operation
Timer 4 is temporarily stopped.
Timer 4 count source is selected.
PWM signal “H” interval expansion function control is set.
b3
b0
Timer control register W4 0 1 0 0
[TW4A]
b2: PWM signal “H” interval expansion function valid
b1: Timer 4 stop
b0: XIN selected for Timer 4 count source
↓
➃ Set Port
PWM signal output from CNTR1 pin is set.
Timer control register W6
b3
b0
✕✕ 0 ✕
Port C output latch 0
Timer control register W3
b3
b0
✕✕ 0 1
b1: CNTR1 output auto-control circuit not selected [TW6A]
[RCP]
b1, b0: Timer 3 count source selected (Note 2) [TW3A]
↓
➄ Set Timer Value
Timer 4 count time is set.
Timer 4 reload register R4L
Timer 4 reload register R4H
“0316”
“0216”
Timer count value 3 set [T4AB]
Timer count value 2 set [T4HAB]
➅ Start Timer Operation
Timer 4 temporarily stopped is restarted.
CNTR1 output control is set to be valid.
Timer control register W4
↓
b3
b0
1110
[TW4A]
b3: CNTR1 output valid
b1: Timer 4 operation start
➆ Set Interrupts (Note 1)
Interrupts except Timer 4 interrupt is enabled.
↓
[EI]
↓
PWM output started
Notes 1: ➀ and ➆ are not required when serial I/O interrupt is used.
2: Set the count sources except the CNTR1 input as the timer 3 count source.
“✕”: it can be “0” or “1.”
“[ ]”: instruction
Fig. 2.3.8 PWM output control setting example
Rev.2.00 Aug, 06 2004
REJ09B0107-0200Z
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