AT89LP428 Atmel Corporation, AT89LP428 Datasheet - Page 32

• Manufacturer Part Number: AT89LP428
• Manufacturer: Atmel Corporation

Specifications of AT89LP428

• Flash (kbytes): 4 Kbytes
• Max. Operating Frequency: 25 MHz
• Cpu: 8051-1C
• Max I/o Pins: 30
• Spi: 1
• Uart: 1
• Sram (kbytes): 0.75
• Eeprom (bytes): 512
• Self Program Memory: IAP
• Operating Voltage (vcc): 2.4 to 5.5
• Timers: 3
• Isp: SPI/OCD
• Watchdog: Yes

9.2
Table 9-2.
Table 9-3.
32
Symbol
EA
EC
ET2
ES
ET1
EX1
ET0
EX0
Symbol
IP0D
PC
PT2
PS
PT1
PX1
PT0
PX0
IE = A8H
Bit Addressable
Bit
IP = B8H
Bit Addressable
Bit
Interrupt Registers
AT89LP428/828
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.
Comparator Interrupt Enable
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
Interrupt Priority 0 Disable. Set IP0D to 1 to disable all interrupts with priority level zero. Clear to 0 to enable all interrupts
with priority level zero when EA = 1.
Comparator Interrupt Priority Low
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
IE – Interrupt Enable Register
IP – Interrupt Priority Register
IP0D
EA
7
7
PC
EC
6
6
ET2
PT2
5
5
ES
PS
4
4
ET1
PT1
3
3
EX1
PX1
2
2
Reset Value = 0000 0000B
Reset Value = 0000 0000B
ET0
PT0
1
1
3654A–MICRO–8/09
EX0
PX0
0
0