AT89C51RE2-RLTUM Atmel, AT89C51RE2-RLTUM Datasheet - Page 116

• Manufacturer Part Number: AT89C51RE2-RLTUM
• Description: MCU 8051 128K FLASH 44-VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51RE2-RLTUM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 128KB (128K x 8)
• Program Memory Type: FLASH
• Ram Size: 8K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Processor Series: AT89x
• Core: 8051
• Data Bus Width: 8 bit
• Data Ram Size: 8 KB
• Interface Type: UART, SPI
• Maximum Clock Frequency: 60 MHz
• Number Of Programmable I/os: 34
• Number Of Timers: 3
• Operating Supply Voltage: 2.7 V to 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: PK51, CA51, A51, ULINK2
• Development Tools By Supplier: AT89OCD-01
• Minimum Operating Temperature: - 40 C
• Height: 1.45 mm
• Length: 10.1 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 10.1 mm
• For Use With: AT89STK-11 - KIT STARTER FOR AT89C51RX2
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Data Converters: -
• Lead Free Status / Rohs Status: Details

116
AT89C51RE2
Table 86. IPH1 Register
IPH1 - Interrupt Priority High Register (B3h)
Reset Value = XXXX 00X0b
Not bit addressable
Number
Bit
7
-
7
6
5
4
3
2
1
0
Mnemonic
PSH_1
KBDH
TWIH
SPIH
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 High bit
PSH_1 PSL_1 Priority Level
0
0
1
1
SPI interrupt Priority High bit
SPIH SPIL
0
0
1
1
TWI interrupt Priority High bit
TWIH TWIL
0
0
1
1
Keyboard interrupt Priority High bit
KB DH
0
0
1
1
5
-
1
0
1
0
1
0
1
0
1
0
0
1
KBDL Priority Level
0
1
0
1
Lowest
Highest
Priority Level
Lowest
Highest
Priority Level
Lowest
Highest
4
Highest
-
Lowest
PSH_1
3
SPIH
2
TWIH
1
7663E–8051–10/08
KBDH
0