at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 117

• Manufacturer Part Number: at89c51re2-slsem
• Description: At89c51re2 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

100
AT89C51RE2
Table 80. IPH1 Register
IPH1 - Interrupt Priority High Register (B3h)
Reset Value = XXXX 00X0b
Not bit addressable
Number
Bit
7
-
7
6
5
4
3
2
1
0
Mnemonic Description
PSH_1
KBDH
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.
Serial port 1 Priority High bit
PSH_1 PSL_1Priority Level
0
0
1
1
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
0
0
1
1
0Lowest
1
0
1Highest
5
-
KBDLPriority Level
SPILPriority Level
0 Lowest
1
0
1 Highest
0 Lowest
1
0
1 Highest
4
-
PSH_1
3
SPIH
2
1
-
7663B–8051–03/07
KBDH
0