AT89C51IC2-SLSIL Atmel, AT89C51IC2-SLSIL Datasheet - Page 65

• Manufacturer Part Number: AT89C51IC2-SLSIL
• Description: IC 8051 MCU FLASH 32K 44PLCC
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51IC2-SLSIL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Ram Size: 1.25K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 3.6 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-PLCC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

4301D–8051–02/08
Table 53. 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
TWIH
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
SPIHSPILPriority Level
0
0
1
1
TWI interrupt Priority High bit
TWIHTWILPriority Level
0
0
1
1
Keyboard interrupt Priority High bit
KB DHKBDLPriority Level
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
5
-
Lowest
Highest
Lowest
Highest
Highest
Lowest
4
-
3
-
SPIH
2
TWIH
1
KBDH
0
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