AT89C51RC2 Atmel Corporation, AT89C51RC2 Datasheet - Page 62

• Manufacturer Part Number: AT89C51RC2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RC2

• Flash (kbytes): 32 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 1.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

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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
SPIHSPIL
0
0
1
1
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Keyboard Interrupt Priority High Bit
KB DHKBDL
0
0
1
1
5
-
0
1
0
1
0
1
0
1
Priority Level
Lowest
Highest
Priority Level
Lowest
Highest
4
-
3
-
SPIH
2
1
-
4180E–8051–10/06
KBDH
0