at89c51ic2-slsim ATMEL Corporation, at89c51ic2-slsim Datasheet - Page 65
at89c51ic2-slsim
Manufacturer Part Number
at89c51ic2-slsim
Description
At89c51ic2 8-bit Flash Microcontroller With 2-wire Interface
Manufacturer
ATMEL Corporation
Datasheet
1.AT89C51IC2-SLSIM.pdf
(147 pages)
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4301D–8051–02/08
Table 53. 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
SPIHSPILPriority Level
0
0
1
1
TWI interrupt Priority High bit
TWIHTWILPriority Level
0
0
1
1
Keyboard interrupt Priority High bit
KB DHKBDLPriority Level
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
5
-
Lowest
Highest
Lowest
Highest
Highest
Lowest
4
-
3
-
SPIH
2
TWIH
1
KBDH
0
65
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