AT89C51ID2 Atmel Corporation, AT89C51ID2 Datasheet - Page 32

• Manufacturer Part Number: AT89C51ID2
• Manufacturer: Atmel Corporation

Specifications of AT89C51ID2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Twi (i2c): 1
• Uart: 1
• Sram (kbytes): 2
• Eeprom (bytes): 2048
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

Reset Output
32
AT89C51ID2
As detailed in Section “Hardware Watchdog Timer”, page 107, the WDT generates a 96-
clock period pulse on the RST pin. In order to properly propagate this pulse to the rest of
the application in case of external capacitor or power-supply supervisor circuit, a 1 kΩ
resistor must be added as shown Figure 9.
Figure 9. Recommended Reset Output Schematic
VDD
VDD
VSS
+
RST
1K
RST
AT89C51ID2
To other
on-board
circuitry
4289C–8051–11/05