AT89S52-24PI Atmel, AT89S52-24PI Datasheet - Page 18

• Manufacturer Part Number: AT89S52-24PI
• Description: IC MCU 8K FLASH 24MHZ 40-DIP
• Manufacturer: Atmel
• Series: 89Sr

Specifications of AT89S52-24PI

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 24MHz
• Connectivity: UART/USART
• Peripherals: WDT
• Number Of I /o: 32
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 4 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

Table 13-1.
Figure 13-1. Interrupt Sources
18
Symbol
EA
–
ET2
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
AT89S52
Interrupt Enable (IE) Register
Position
IE.7
IE.6
IE.5
IE.4
IE.3
IE.2
IE.1
IE.0
–
ET2
EXF2
INT0
INT1
TF0
TF1
TF2
RI
TI
Function
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.
Reserved.
Timer 2 interrupt enable bit.
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.
0
1
0
1
ES
(LSB)
ET1
IE0
IE1
EX1
ET0
EX0
1919D–MICRO–6/08