AT89C51ID2-SLSIM Atmel, AT89C51ID2-SLSIM Datasheet - Page 70
AT89C51ID2-SLSIM
Manufacturer Part Number
AT89C51ID2-SLSIM
Description
C51ID2 64KF TWI 32KHZ PLCC44 3-5.5V IND.
Manufacturer
Atmel
Datasheet
1.AT89C51ID2-SLSIM.pdf
(157 pages)
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AT89C51ID2
Table 55. IPH1 Register
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 Description
KBDH
TWIH
SPIH
Bit
6
-
-
-
-
-
-
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
TWI interrupt Priority High bit
TWIH
0
0
1
1
Keyboard interrupt Priority High bit
KB DH
0
0
1
1
5
-
TWILPriority Level
KBDLPriority Level
SPILPriority Level
0 Lowest
1
0
1 Highest
0 Lowest
1
0
1 Highest
0 Lowest
1
0
1 Highest
4
-
3
-
SPIH
2
TWIH
1
4289C–8051–11/05
KBDH
0
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