NEC PD75P402 Manual do Utilizador descarregar pdf (Página 141)

130

CHAPTER 6. INTERRUPT FUNCTIONS

(2) External interrupt input pin hardware

The configuration of INT0 and INT2 is shown in Fig. 6-3.

Fig. 6-3 Configuration of INT0 and INT2

4

IM0

Input

Buffer

Input Buffer 

with Hysteresis 

Characteristics

Internal Bus

INT2/P12

INT0/P10

Sampling Clock

Noise Elimina-

tion Circuit

Selector

Analog Delay

Noise Elimina-

tion Circuit

Φ



64

Edge Detec-

tion Circuit

Rising Edge

Detection

Circuit

Φ

IM01, IM00

IM03

2

INT0

(IRQ0 Setting Signal)

INT2

(IRQ2 Setting Signal)

INT0 functions as an external interrupt input on which sampling clock noise elimination and detected edge

selection can be performed. The INT0 noise elimination circuit detects a change in level in 2 sampling clock pulses.

Therefore, pulses narrower than the width of the 2 cycles (2t

CY* or 128/fXX) of sampling clock are eliminated as noise,

and a pulse exceeding the width is properly acknowledged as an interrupt signal (see Fig. 6-4). One of 3 clocks can

be selected as the timing clocks.

* Cycle time

1 2 ... 136 137 138 139 140 141 142 143 144 145 146 ... 194 195

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