4501 datasheet(147/212 Pages) RENESAS

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2.3 Timers

2-30

Rev.2.01

Feb 07, 2005

4501 Group

APPLICATION

REJ09B0192-0201

Fig. 2.3.7 Timer start by external input setting example (2)

b3b0

➇ Set Valid Waveform

Valid waveform of INT pin is selected.

INT pin input enabled, rising selected, Timer 1 control is enabled.

Interrupt control register I1 1

Rising edge detected (TI1A instruction)

1 0

Enable Interrupts

The timer 1 interrupt which is temporarily disabled is enabled.

Interrupt control register V1

“1”

Timer 1 interrupt occurrence enabled

(TV1A instruction)

All interrupts enabled (EI instruction)

✕✕

Timer start by external input

“✕”: it can be “0” or “1.”

Interrupt enable flag INTE

b3b0

➈ Set Auto-stop circuit

Timer 1 count auto-stop is selected.

Interrupt control register W2

Timer 1 count auto-stop selected

(TW2A instruction)

1 ✕

➉ Clear Interrupt Request

INT interrupt activated condition is cleared.

External 0 interrupt request flag EXF0

“0”

INT interrupt activated condition cleared

(SNZ0 instruction)

Note when the interrupt request is cleared

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

interrupt request flag EXF0, insert the NOP instruction after the SNZ0 instruction.

Continued from Figure 2.3.6 on the preceding page.

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