AT89C51RB2 Atmel Corporation, AT89C51RB2 Datasheet - Page 57

• Manufacturer Part Number: AT89C51RB2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RB2

• Flash (kbytes): 16 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 1.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

4180E–8051–10/06
Table 44. IENO Register
IEN0 - Interrupt Enable Register (A8h)
Reset Value = 0000 0000b
Bit addressable
Number
EA
Bit
7
7
6
5
4
3
2
1
0
Mnemonic Description
EC
ET2
ET1
EX1
ET0
EX0
Bit
EC
EA
ES
6
Enable All Interrupt Bit
Cleared to disable all interrupts.
Set to enable all interrupts.
PCA Interrupt Enable Bit
Cleared to disable.
Set to enable.
Timer 2 Overflow Interrupt Enable Bit
Cleared to disable timer 2 overflow interrupt.
Set to enable timer 2 overflow interrupt.
Serial Port Enable Bit
Cleared to disable serial port interrupt.
Set to enable serial port interrupt.
Timer 1 Overflow Interrupt Enable Bit
Cleared to disable timer 1 overflow interrupt.
Set to enable timer 1 overflow interrupt.
External Interrupt 1 Enable Bit
Cleared to disable external interrupt 1.
Set to enable external interrupt 1.
Timer 0 Overflow Interrupt Enable Bit
Cleared to disable timer 0 overflow interrupt.
Set to enable timer 0 overflow interrupt.
External Interrupt 0 Enable Bit
Cleared to disable external interrupt 0.
Set to enable external interrupt 0.
ET2
5
ES
4
ET1
3
AT89C51RB2/RC2
EX1
2
ET0
1
EX0
0
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