AT89C51ID2-RLRIM Atmel, AT89C51ID2-RLRIM Datasheet - Page 34

• Manufacturer Part Number: AT89C51ID2-RLRIM
• Description: IC MCU FLASH 8051 64K 5V 44-VQFP
• Manufacturer: Atmel
• Series: 89Cr

Specifications of AT89C51ID2-RLRIM

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 60MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 34
• Program Memory Size: 64KB (64K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 44-TQFP, 44-VQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Data Converters: -
• Other names: AT89C51ID2RLRIMTR

The Power fail detect monitor the supply generated by the voltage regulator and gener-
ate a reset if this supply falls below a safety threshold as illustrated in the Figure 11
below.
Figure 11. Power Fail Detect
Vcc
t
Reset
Vcc
When the power is applied, the Power Monitor immediately asserts a reset. Once the
internal supply after the voltage regulator reach a safety level, the power monitor then
looks at the XTAL clock input. The internal reset will remain asserted until the Xtal1 lev-
els are above and below VIH and VIL. Further more. An internal counter will count 1024
clock periods before the reset is de-asserted.
If the internal power supply falls below a safety level, a reset is immediately asserted.
AT89C51ID2
34
4289C–8051–11/05