at89c51rd2-smsum ATMEL Corporation, at89c51rd2-smsum Datasheet - Page 79

• Manufacturer Part Number: at89c51rd2-smsum
• Description: 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

4235J–8051–01/08
Table 17-8.
IPH1 - Interrupt Priority High Register (B3h)
Reset Value = XXXX X000b
Not bit addressable
Number
Bit
7
7
6
5
4
3
2
1
0
-
Mnemonic
IPH1 Register
KBDH
SPIH
Bit
6
-
-
-
-
-
-
-
Description
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Reserved
The value read from this bit is indeterminate. Do not set this bit.
SPI interrupt Priority High bit
SPIH
0
0
1
1
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Keyboard interrupt Priority High bit
KB DH KBDL
0
0
1
1
5
-
SPIL
0
1
0
1
0
1
0
1
Priority Level
Lowest
Highest
Priority Level
Highest
Lowest
4
-
3
-
AT89C51RD2/ED2
SPIH
2
1
-
KBDH
0
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