Rainbow-electronics AT89LP216 Manual do Utilizador descarregar pdf (Página 20)

3621A–MICRO–6/06

AT89LP216 [Preliminary]

Figure 12-1. Minimum Interrupt Response Time

Figure 12-2. Maximum Interrupt Response Time

Clock Cycles

INT0

IE0

Instruction LCALL 1st ISR Instr.Cur. Instr.

Ack.

Clock Cycles

INT0

IE0

113

Instruction RETI 4 Cyc. Instr. LCALL 1st ISR I

Ack.

Table 12-2. IE – Interrupt Enable Register

IE = A8H Reset Value = 0000 0000B

Bit Addressable

EA EC EGP ES ET1 EX1 ET0 EX0

Bit76543210

Symbol Function

EA Global enable/disable. All interrupts are disabled when EA = 0. When EA = 1, each interrupt source is enabled/disabled

by setting /clearing its own enable bit.

EC Comparator Interrupt Enable

EGP General-purpose Interrupt Enable

ES Serial Port Interrupt Enable

ET1 Timer 1 Interrupt Enable

EX1 External Interrupt 1 Enable

ET0 Timer 0 Interrupt Enable

EX0 External Interrupt 0 Enable

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