4502 datasheet(148/214 Pages) RENESAS

148 / 214 page

2.3 Timers

2-31

4502 Group

APPLICATION

Rev.2.01

Feb 02, 2005

REJ09B0193-0201

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.

4502 Datasheet(PDF) 148 Page - Renesas Technology Corp

4502 Datasheet(HTML) 148 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL