AT89S51-24 ATMEL [ATMEL Corporation], AT89S51-24 Datasheet - Page 10

• Manufacturer Part Number: AT89S51-24
• Description: 8-bit Microcontroller with 4K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

10
AT89S51
.
Table 4. Interrupt Enable (IE) Register
Figure 1. Interrupt Sources
Symbol
EA
–
–
ES
ET1
EX1
ET0
EX0
User software should never write 1s to reserved bits, because they may be used in future AT89
products.
(MSB)
Enable Bit = 1 enables the interrupt.
Enable Bit = 0 disables the interrupt.
EA
–
Position
IE.7
IE.6
IE.5
IE.4
IE.3
IE.2
IE.1
IE.0
INT0
INT1
–
TF0
TF1
RI
TI
0
1
0
1
ES
Function
acknowledged. If EA = 1, each interrupt source is
individually enabled or disabled by setting or clearing
its enable bit.
Disables all interrupts. If EA = 0, no interrupt is
Reserved
Reserved
Serial Port interrupt enable bit
Timer 1 interrupt enable bit
External interrupt 1 enable bit
Timer 0 interrupt enable bit
External interrupt 0 enable bit
ET1
(LSB)
IE0
IE1
EX1
ET0
EX0
2487A–10/01