Datasheet

41
AT8xC51SND1C
4109E–8051–06/03
Table 52. IEN1 Register
IEN1 (S:B1h) – Interrupt Enable Register 1
Reset Value = 0000 0000b
76543210
- EUSB - EKB EADC ESPI EI2C EMMC
Bit
Number
Bit
Mnemonic Description
7-
Reserved
The value read from this bit is always 0. Do not set this bit.
6EUSB
USB Interface Interrupt Enable Bit
Set this bit to enable USB interrupts.
Clear this bit to disable USB interrupts.
5-
Reserved
The value read from this bit is always 0. Do not set this bit.
4EKB
Keyboard Interface Interrupt Enable Bit
Set to enable Keyboard interrupt.
Clear to disable Keyboard interrupt.
3 EADC
A to D Converter Interrupt Enable Bit
Set to enable ADC interrupt.
Clear to disable ADC interrupt.
2ESPI
SPI Controller Interrupt Enable Bit
Set to enable SPI interrupt.
Clear to disable SPI interrupt.
1EI2C
Two Wire Controller Interrupt Enable Bit
Set to enable Two Wire interrupt.
Clear to disable Two Wire interrupt.
0EMMC
MMC Interface Interrupt Enable Bit
Set to enable MMC interrupt.
Clear to disable MMC interrupt.