Datasheet

86
4337K–USB–04/08
AT89C5130A/31A-M
Table 16-7. IPH1 Register
IPH1 - Interrupt Priority High Register (B3h)
Reset Value = X0XX X000b
Not bit addressable
7 6 5 4 3 2 1 0
- PUSBH - - - PSPIH PTWIH 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
PUSBH PUSBL Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
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
PSPIH PSPIL Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
1 PTWIH
TWI Interrupt Priority High bit
PTWIH PTWIL Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest
0 PKBH
Keyboard Interrupt Priority High bit
PKBH PKBL Priority Level
0 0 Lowest
0 1
1 0
1 1 Highest