Datasheet

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

78

4235K–8051–05/08

AT89C51RD2/ED2

Table 17-7. IPL1 Register

IPL1 - Interrupt Priority Register (B2h)

Reset Value = XXXX X000b

Bit addressable

7 6 5 4 3 2 1 0

- - - - - SPIL TWIL KBDL

Bit

Number

Bit

Mnemonic Description

7 -

Reserved

The value read from this bit is indeterminate. Do not set this bit.

6 -

Reserved

The value read from this bit is indeterminate. Do not set this bit.

5 -

Reserved

The value read from this bit is indeterminate. Do not set this bit.

4 -

Reserved

The value read from this bit is indeterminate. Do not set this bit.

3 -

Reserved

The value read from this bit is indeterminate. Do not set this bit.

2 SPIL

SPI interrupt Priority bit

Refer to SPIH for priority level.

1 -

Reserved

The value read from this bit is indeterminate. Do not set this bit.

0 KBDL

Keyboard interrupt Priority bit

Refer to KBDH for priority level.