AT89C51RB2-RLTIL Atmel, AT89C51RB2-RLTIL Datasheet - Page 62

• Manufacturer Part Number: AT89C51RB2-RLTIL
• Description: IC 8051 MCU FLASH 16K 44VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51RB2-RLTIL

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 40MHz
• Connectivity: SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (16K 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-TQFP, 44-VQFP
• For Use With: AT89STK-11 - KIT STARTER FOR AT89C51RX2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

62
AT89C51RB2/RC2
Table 49. 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
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
SPIHSPIL
0
0
1
1
Reserved
The value read from this bit is indeterminate. Do not set this bit.
Keyboard Interrupt Priority High Bit
KB DHKBDL
0
0
1
1
5
-
0
1
0
1
0
1
0
1
Priority Level
Lowest
Highest
Priority Level
Lowest
Highest
4
-
3
-
SPIH
2
1
-
4180E–8051–10/06
KBDH
0