AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 113

• Manufacturer Part Number: AT89C51RE2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RE2

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Spi: 1
• Uart: 2
• Sram (kbytes): 8.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART/OCD
• Watchdog: Yes

7663E–8051–10/08
Table 83. IPH0 Register
IPH0 - Interrupt Priority High Register (B7h)
Reset Value = X000 0000b
Not bit addressable
Number
Bit
7
7
6
5
4
3
2
1
0
-
Mnemonic
PPCH
PPCH
PX1H
PX0H
PT2H
PT1H
PT0H
PSH
Bit
6
-
Description
Reserved
The value read from this bit is indeterminate. Do not set this bit.
PCA interrupt Priority high bit.
PPCH PPCL Priority Level
0
0
1
1
Timer 2 overflow interrupt Priority High bit
PT2H PT2L
0
0
1
1
Serial port Priority High bit
PSH
0
0
1
1
Timer 1 overflow interrupt Priority High bit
PT1H PT1L
0
0
1
1
External interrupt 1 Priority High bit
PX1H PX1L
0
0
1
1
Timer 0 overflow interrupt Priority High bit
PT0H PT0L
0
0
1
1
External interrupt 0 Priority High bit
PX0H PX0L
0
0
1
1
PT2H
5
0
1
0
1
0
1
0
1
PSL
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
Lowest
Highest
Priority Level
Lowest
Highest
Priority Level
Lowest
Highest
Highest
Priority Level
Lowest
Highest
Priority Level
Lowest
Highest
Priority Level
Lowest
Highest
Priority Level
Lowest
PSH
4
PT1H
3
PX1H
2
AT89C51RE2
PT0H
1
PX0H
0
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