AT89LP51 Atmel Corporation, AT89LP51 Datasheet - Page 40

• Manufacturer Part Number: AT89LP51
• Manufacturer: Atmel Corporation

Specifications of AT89LP51

• Flash (kbytes): 4 Kbytes
• Max. Operating Frequency: 20 MHz
• Cpu: 8051-1C
• Max I/o Pins: 36
• Uart: 1
• Sram (kbytes): 0.25
• Eeprom (bytes): 256
• Self Program Memory: IAP
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 3
• Isp: SPI
• Watchdog: Yes

Table 9-2.
Table 9-3.
Table 9-4.
40
Symbol
EA
ET2
ES
ET1
EX1
ET0
EX0
Symbol
PT2
PS
PT1
PX1
PT0
PX0
Symbol
PT2H
PSH
PT1H
PX1H
PT0H
PX0H
IE = A8H
Bit Addressable
Bit
IP = B8H
Bit Addressable
Bit
IPH = B7H
Not Bit Addressable
Bit
AT89LP51/52
Function
Global enable/disable. All interrupts are disabled when EA = 0. When EA = 1, each interrupt source is enabled/disabled by setting
/clearing its own enable bit.
Timer 2 Interrupt Enable
Serial Port Interrupt Enable
Timer 1 Interrupt Enable
External Interrupt 1 Enable
Timer 0 Interrupt Enable
External Interrupt 0 Enable
Function
Timer 2 Interrupt Priority Low
Serial Port Interrupt Priority Low
Timer 1 Interrupt Priority Low
External Interrupt 1 Priority Low
Timer 0 Interrupt Priority Low
External Interrupt 0 Priority Low
Function
Timer 2 Interrupt Priority High
Serial Port Interrupt Priority High
Timer 1 Interrupt Priority High
External Interrupt 1 Priority High
Timer 0 Interrupt Priority High
External Interrupt 0 Priority High
IE – Interrupt Enable Register
IP – Interrupt Priority Register
IPH – Interrupt Priority High Register
EA
7
–
7
–
7
–
6
–
6
–
6
PT2H
ET2
PT2
5
5
5
PSH
ES
PS
4
4
4
PT1H
ET1
PT1
3
3
3
PX1H
EX1
PX1
2
2
2
Reset Value = 0000 0000B
Reset Value = 0000 0000B
Reset Value = 0000 0000B
PT0H
ET0
PT0
1
1
1
3709D–MICRO–12/11
PX0H
EX0
PX0
0
0
0