4513 datasheet(138/210 Pages) RENESAS

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2.3 Timers

2-35

4513/4514 Group User’s Manual

Fig. 2.3.6 CNTR0 output control setting example

Disable Interrupts

Timer 3 and timer 4 interrupt are temporarily disabled.

Interrupt enable flag INTE

Interrupt control register V2

“0”

All interrupts disabled (DI instruction)

Timer 3 and timer 4 interrupt occurrence disabled

(TV2A instruction)

Stop Timer Operation

Timer is temporarily stopped.

Dividing ratio of prescaler is selected.

Timer 3 count source is selected.

Timer 4 count source is selected.

Timer control register W3

Timer 3 stop (TW3A instruction)

Prescaler selected for count source

Timer 4 stop (TW4A instruction)

Timer 3 underflow selected for count source

Instruction clock divided by 4 selected

(TW1A instruction)

Timer control register W4

Timer control register W1

Set Timer Value, Select CNTR1 Output

CNTR1 output is selected.

Timer 3 and timer 4 count time are set.

Timer control register W6

Timer 3 reload register R3

Timer 3 reload register R4

“2916”

“FF16”

Timer count value 41 set (T3AB instruction)

Timer count value 255 set (T4AB instruction)

CNTR1 output selected (TW6A instruction)

Start Timer Operation

Timer 3 and timer 4 temporarily stopped are restarted.

Timer 3 operation start (TW3A instruction)

Timer 4 operation start (TW4A instruction)

Timer control register W3

Timer control register W4

Enable Interrupts

Interrupt enable flag INTE

“1”

All interrupts enabled (EI instruction)

“!”: it can be “0” or “1.”

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