Datasheet

62
AT89C51RB2/RC2
4180E–8051–10/06
Table 49. IPH1 Register
IPH1 - Interrupt Priority High Register (B3h)
Reset Value = XXXX X000b
Not bit addressable
76543210
- - - - - SPIH - KBDH
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.
2SPIH
SPI Interrupt Priority High Bit
SPIH
SPIL Priority Level
00Lowest
01
10
1 1 Highest
1-
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0 KBDH
Keyboard Interrupt Priority High Bit
KB DH
KBDL Priority Level
00Lowest
01
10
1 1 Highest