AT89C51RB2-RLTCM ATMEL [ATMEL Corporation], AT89C51RB2-RLTCM Datasheet - Page 60

• Manufacturer Part Number: AT89C51RB2-RLTCM
• Description: 8-bit Microcontroller with 16K/ 32K Bytes Flash
• Manufacturer: ATMEL [ATMEL Corporation]

60
AT89C51RB2/RC2
Table 49. 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
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
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
5
-
SPIL
0
1
0
1
KBDL
0
1
0
1
Priority Level
Lowest
Highest
Priority Level
Lowest
Highest
4
-
3
-
SPIH
2
1
-
4180B–8051–04/03
KBDH
0