Rainbow-electronics AT89C55WD Manual do Utilizador descarregar pdf (Página 18)

AT89C55WD

1921B–MICRO–09/02

Figure 10. Interrupt Sources

Table 7 . Interrupt Enable (IE) Register

(MSB) (LSB)

– ET2 ES ET1 EX1 ET0 EX0

Enable Bit = 1 enables the interrupt.

Enable Bit = 0 disables the interrupt.

Symbol Position Function

EA IE.7 Disables all interrupts. If EA = 0, no interrupt is acknowledged. If EA

= 1, each interrupt source is individually enabled or disabled by

setting or clearing its enable bit.

– IE.6 Reserved.

ET2 IE.5 Timer 2 interrupt enable bit.

ES IE.4 Serial Port interrupt enable bit.

ET1 IE.3 Timer 1 interrupt enable bit.

EX1 IE.2 External interrupt 1 enable bit.

ET0 IE.1 Timer 0 interrupt enable bit.

EX0 IE.0 External interrupt 0 enable bit.

User software should never write 1s to reserved bits, because they may be used in future AT89

products.

IE1

IE0

TF1

TF0

INT1

INT0

TF2

EXF2

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 36 37

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Rainbow-electronics AT89C55WD Manual do Utilizador Página 18