Rainbow Electronics AT89C51SND1C - Manual (Page 45)

45
AT8xC51SND1C
4109E–8051–06/03
Table 56. IPL1 Register
IPL1 (S:B2h) – Interrupt Priority Low Register 1
Reset Value = 0000 0000b
7 6 5 4 3 2 1 0
- 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.
6 IPLUSB
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.
4 IPLKB
Keyboard Interrupt Priority Level LSB
Refer to Table 49 for priority level description.
3 IPLADC
A to D Converter Interrupt Priority Level LSB
Refer to Table 49 for priority level description.
2 IPLSPI
SPI Interrupt Priority Level LSB
Refer to Table 49 for priority level description.
1 IPLI2C
Two Wire Controller Interrupt Priority Level LSB
Refer to Table 49 for priority level description.
0 IPLMMC
MMC Interrupt Priority Level LSB
Refer to Table 49 for priority level description.