AT89C51RB2 Atmel Corporation, AT89C51RB2 Datasheet - Page 60

• 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

60
AT89C51RB2/RC2
Table 47. IEN1 Register
IEN1 - Interrupt Enable Register (B1h)
Reset Value = XXXX X000b
Bit addressable
Number
Bit
7
7
6
5
4
3
2
1
0
-
Mnemonic Description
ESPI
KBD
Bit
6
-
-
-
-
-
-
-
Reserved
Reserved
Reserved
Reserved
Reserved
SPI Interrupt Enable Bit
Cleared to disable SPI interrupt.
Set to enable SPI interrupt.
Reserved
Keyboard Interrupt Enable Bit
Cleared to disable keyboard interrupt.
Set to enable keyboard interrupt.
5
-
4
-
3
-
ESPI
2
1
-
4180E–8051–10/06
KBD
0