Datasheet

ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller PLCC 44 (16.59x16.59) 8-Bit 60 MHz I/O number 34

77

4235K–8051–05/08

AT89C51RD2/ED2

Table 17-6. IEN1 Register

IEN1 - Interrupt Enable Register (B1h)

Reset Value = XXXX X000b

Bit addressable

7 6 5 4 3 2 1 0

- - - - - ESPI - KBD

Bit

Number

Bit

Mnemonic Description

7 -

Reserved

6 -

Reserved

5 -

Reserved

4 -

Reserved

3 -

Reserved

2 ESPI

SPI interrupt Enable bit

Cleared to disable SPI interrupt.

Set to enable SPI interrupt.

1

Reserved

0 KBD

Keyboard interrupt Enable bit

Cleared to disable keyboard interrupt.

Set to enable keyboard interrupt.