AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 75

• Manufacturer Part Number: AT89C51RD2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RD2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 2
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

4235K–8051–05/08
Table 17-4.
IPL0 - Interrupt Priority Register (B8h)
Reset Value = X000 0000b
Bit addressable
Number
Bit
7
7
6
5
4
3
2
1
0
-
Mnemonic
IPL0 Register
PPCL
PPCL
PX1L
PX0L
PT2L
PT1L
PT0L
PSL
Bit
6
-
Description
Reserved
The value read from this bit is indeterminate. Do not set this bit.
PCA interrupt Priority bit
Refer to PPCH for priority level.
Timer 2 overflow interrupt Priority bit
Refer to PT2H for priority level.
Serial port Priority bit
Refer to PSH for priority level.
Timer 1 overflow interrupt Priority bit
Refer to PT1H for priority level.
External interrupt 1 Priority bit
Refer to PX1H for priority level.
Timer 0 overflow interrupt Priority bit
Refer to PT0H for priority level.
External interrupt 0 Priority bit
Refer to PX0H for priority level.
PT2L
5
PSL
4
PT1L
3
AT89C51RD2/ED2
PX1L
2
PT0L
1
PX0L
0
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