AT89C51AC3 Atmel Corporation, AT89C51AC3 Datasheet - Page 120

• Manufacturer Part Number: AT89C51AC3
• Manufacturer: Atmel Corporation

Specifications of AT89C51AC3

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 62.5
• Sram (kbytes): 2.25
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 3.0 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

120
AT89C51AC3
Table 70. IPH1 Register
IPH1 (S:F7h)
Interrupt High Priority Register 1
Reset Value = XXXX 0X0Xb
Number
Bit
7
-
7
6
5
4
3
2
1
0
Mnemonic Description
PADCH
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.
SPI Interrupt Priority Level Most Significant bit
SPIH SPIL Priority level
0
0
1
1
Reserved
The value read from this bit is indeterminate. Do not set this bit.
ADC Interrupt Priority Level Most Significant bit
PADCH PADCL Priority level
0
0
1
1
Reserved
The value read from this bit is indeterminate. Do not set this bit.
5
-
0
1
0
1
0
1
0
1
Lowest
Highest
Lowest
Highest
4
-
SPIH
3
2
-
4383D–8051–02/08
PADCH
1
0
-