AT89 datasheet(20/41 Pages) ATMEL

Part #	AT89

Description	8-Bit Microcontroller with 8K Bytes Flash

PDF	41 Pages

Scroll/Zoom	100%

Manufacturer	ATMEL [ATMEL Corporation]

Direct Link	http://www.atmel.com

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20 / 41 page

AT89S8252

0401F–MICRO–11/03

Figure 10. Interrupt Sources

Table 10. Interrupt Enable (IE) Register

(MSB)(LSB)

–

ET2

ET1

EX1

ET0

EX0

Enable Bit = 1 enables the interrupt.

Enable Bit = 0 disables the interrupt.

Symbol

Position

Function

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.

IE.4

SPI and UART 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 unimplemented bits, because they may be used in future AT89 products.

AT89 Datasheet(PDF) 20 Page - ATMEL Corporation