AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 115

• 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 85. IPL1 Register
IPL1 - Interrupt Priority Register (B2h)
Reset Value = XXXX 00X0b
Bit addressable
Number
Bit
7
-
7
6
5
4
3
2
1
0
Mnemonic
PSL_1
KBDL
TWIL
SPIL
Bit
6
-
-
-
-
-
Description
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 bit
Refer to PSH_1 for priority level.
SPI interrupt Priority bit
Refer to SPIH for priority level.
TWI interrupt Priority bit
Refer to TWIH for priority level.
Keyboard interrupt Priority bit
Refer to KBDH for priority level.
5
-
4
-
PSL_1
3
SPIL
2
AT89C51RE2
TWIL
1
KBDL
0
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