Rainbow Electronics AT89C51SND1C - Manual (Page 41)

41
AT8xC51SND1C
4109E–8051–06/03
Table 52. IEN1 Register
IEN1 (S:B1h) – Interrupt Enable Register 1
Reset Value = 0000 0000b
7 6 5 4 3 2 1 0
- 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.
6 EUSB
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.
4 EKB
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.
2 ESPI
SPI Controller Interrupt Enable Bit
Set to enable SPI interrupt.
Clear to disable SPI interrupt.
1 EI2C
Two Wire Controller Interrupt Enable Bit
Set to enable Two Wire interrupt.
Clear to disable Two Wire interrupt.
0 EMMC
MMC Interface Interrupt Enable Bit
Set to enable MMC interrupt.
Clear to disable MMC interrupt.