Rainbow-electronics AT89LS51 Manual do Utilizador descarregar pdf (Página 10)

AT89LS51

3053A–8051–05/02

Figure 1. Interrupt Sources

Table 4. Interrupt Enable (IE) Register

(MSB) (LSB)

EA – – 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

– IE.5 Reserved

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

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 28 29

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