AT89LP428 Atmel Corporation, AT89LP428 Datasheet - Page 45

• 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

Table 11-2.
3654A–MICRO–8/09
Symbol
TF1
TR1
TF0
TR0
IE1
IT1
IE0
IT0
TCON = 88H
Bit Addressable
Bit
Function
Timer 1 Overflow Flag. Set by hardware on Timer/Counter overflow. Cleared by hardware when the processor vectors
to interrupt routine.
Timer 1 Run Control Bit. Set/cleared by software to turn Timer/Counter on/off.
Timer 0 Overflow Flag. Set by hardware on Timer/Counter overflow. Cleared by hardware when the processor vectors
to interrupt routine.
Timer 0 Run Control Bit. Set/cleared by software to turn Timer/Counter on/off.
Interrupt 1 Edge Flag. Set by hardware when external interrupt edge detected. Cleared when interrupt processed.
Interrupt 1 Type Control Bit. Set/cleared by software to specify falling edge/low level triggered external interrupts.
Interrupt 0 Edge Flag. Set by hardware when external interrupt edge detected. Cleared when interrupt processed.
Interrupt 0 Type Control Bit. Set/cleared by software to specify falling edge/low level triggered external interrupts.
TCON
TF1
7
– Timer/Counter Control Register
TR1
6
TF0
5
TR0
4
IE1
3
IT1
2
Reset Value = 0000 0000B
AT89LP428/828
IE0
1
IT0
0
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