Rainbow Electronics AT89C5131 - Manual (Page 97)

97
AT89C5131
4136A–USB–03/03
Table 70. IPH1 Register
IPH1 - Interrupt Priority High Register (B3h)
Reset Value = XXXX X000b
Not bit addressable
7 6 5 4 3 2 1 0
- - - - - PSPIH - PKBH
Bit
Number
Bit
Mnemonic Description
7 -
Reserved
The value read from this bit is indeterminate. Do not set this bit.
6 PUSBH
USB Interrupt Priority High bit
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 PSPIH
SPI Interrupt Priority High bit
SPIH
SPIL Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
1 -
Reserved
The value read from this bit is indeterminate. Do not set this bit.
0 PKBH
Keyboard Interrupt Priority High bit
KBDH KBDL
Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest