AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 115
AT89C51RE2
Manufacturer Part Number
AT89C51RE2
Description
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
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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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