4513 datasheet(127/210 Pages) RENESAS

127 / 210 page

APPLICATION

2.2 Interrupts

2-24

4513/4514 Group User’s Manual

Fig. 2.2.8 Timer 4 constant period interrupt setting example

Disable Interrupts

Timer 4 interrupt is temporarily disabled.

Interrupt enable flag INTE

Interrupt control register V2

“0”

All interrupts disabled (DI instruction)

Timer 4 interrupt occurrence disabled

(TV2A instruction)

Stop Timer Operation

Timer 4, timer 3 and prescaler are temporarily stopped.

Dividing ratio of prescaler is selected.

Timer control register W1

Prescaler stop (TW1A instruction)

Prescaler divided by 16 selected

Timer 3 stop (TW3A instruction)

Prescaler selected for count source

Timer 4 stop (TW4A instruction)

Timer 3 underflow signal selected for count source

Timer control register W3

Timer control register W4

Set Timer Value

Timer 3 and timer 4 count times are set. (The formula is shown gA below.)

Timer 3 reload register R3

Timer 4 reload register R4

“5216”

“F916”

Timer count value 82 set (T3AB instruction)

Timer count value 249 set (T4AB instruction)

Clear Interrupt Request

Timer 4 interrupt activated condition is cleared.

Timer 4 interrupt request flag T4F “0”

Timer 4 interrupt activated condition cleared

(SNZT4 instruction)

Note when the interrupt request is cleared

When is executed, considering the skip of the next instruction according to the

interrupt request flag T4F, insert the NOP instruction after the SNZT4 instruction.

Start Timer 4 Operation

Timer 4, timer 3 and prescaler temporarily stopped are restarted.

Timer control register W3

Timer 4 operation start (TW4A instruction)

Timer 3 operation start (TW3A instruction)

Prescaler operation start (TW1A instruction)

Timer control register W1

Timer control register W4

Enable Interrupts

The timer 4 interrupt which is temporarily disabled is enabled.

Interrupt control register V2

Interrupt enable flag INTE

“1”

Timer 4 interrupt occurrence enabled

(TV2A instruction)

All interrupts enabled (EI instruction)

Constant period interrupt execution start

gA The prescaler dividing ratio, time 3 count value and timer 4 count value to make the interrupt occur

every 250 ms are set as follows.

250 ms

≅ (4.0 MHz)

16 ! (82+1)

! (249+1)

–1

System clock Instruction

clock

Prescaler

dividing

ratio

Timer 3

count

value

Timer 4

count

value

“!”: it can be “0” or “1.”

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