Rainbow-electronics AT89C51SND1C Manual do Utilizador descarregar pdf (Página 45)

45

AT8xC51SND1C

4109E–8051–06/03

Table 56. IPL1 Register

IPL1 (S:B2h) – Interrupt Priority Low Register 1

Reset Value = 0000 0000b

76543210

- IPLUSB - IPLKB IPLADC IPLSPI IPLI2C IPLMMC

Bit

Number

Bit

Mnemonic Description

7-

Reserved

The value read from this bit is always 0. Do not set this bit.

6IPLUSB

USB Interrupt Priority Level LSB

Refer to Table 49 for priority level description.

5-

Reserved

The value read from this bit is always 0. Do not set this bit.

4IPLKB

Keyboard Interrupt Priority Level LSB

Refer to Table 49 for priority level description.

3IPLADC

A to D Converter Interrupt Priority Level LSB

Refer to Table 49 for priority level description.

2IPLSPI

SPI Interrupt Priority Level LSB

Refer to Table 49 for priority level description.

1IPLI2C

Two Wire Controller Interrupt Priority Level LSB

Refer to Table 49 for priority level description.

0IPLMMC

MMC Interrupt Priority Level LSB

Refer to Table 49 for priority level description.

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 209 210

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