Rainbow-electronics AT89C51SND1C Manuale Utente Scaricare il pdf (Pagina 43)

43

AT8xC51SND1C

4109E–8051–06/03

Table 54. IPH1 Register

IPH1 (S:B3h) – Interrupt Priority High Register 1

Reset Value = 0000 0000b

76543210

- IPHUSB - IPHKB IPHADC IPHSPI IPHI2C IPHMMC

Bit

Number

Bit

Mnemonic Description

7-

Reserved

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

6 IPHUSB

USB Interrupt Priority Level MSB

Refer to Table 49 for priority level description.

5-

Reserved

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

4IPHKB

Keyboard Interrupt Priority Level MSB

Refer to Table 49 for priority level description.

3IPHADC

A to D Converter Interrupt Priority Level MSB

Refer to Table 49 for priority level description.

2IPHSPI

SPI Interrupt Priority Level MSB

Refer to Table 49 for priority level description.

1IPHI2C

Two Wire Controller Interrupt Priority Level MSB

Refer to Table 49 for priority level description.

0IPHMMC

MMC Interrupt Priority Level MSB

Refer to Table 49 for priority level description.

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 209 210

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