Atmel C51 Datenblatt PDF herunterladen (Seite 61)

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AT89C51RB2/RC2

4180E–8051–10/06

Table 48. IPL1 Register

IPL1 - Interrupt Priority Register (B2h)

Reset Value = XXXX X000b

Bit addressable

76543210

- - - - - SPIL - 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

see 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

see KBDH for priority level.

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 126 127

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