Datasheet

4341H–MP3–10/07

AT8xC51SND2C/MP3B

Table 9-5. IEN1 Register

IEN1 (S:B1h) – Interrupt Enable Register 1

Reset Value = 0000 0000b

7 6 5 4 3 2 1 0

- EUSB - EKB - 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.