AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 29
AT89C51RD2
Manufacturer Part Number
AT89C51RD2
Description
Manufacturer
Atmel Corporation
Specifications of AT89C51RD2
Flash (kbytes)
64 Kbytes
Max. Operating Frequency
60 MHz
Cpu
8051-12C
Max I/o Pins
32
Spi
1
Uart
1
Sram (kbytes)
2
Self Program Memory
API
Operating Voltage (vcc)
2.7 to 5.5
Timers
4
Isp
UART
Watchdog
Yes
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Company
Part Number
Manufacturer
Quantity
Price
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Manufacturer:
ATMEL
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Part Number:
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IR
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20 000
Company:
Part Number:
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Manufacturer:
AT
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Company:
Part Number:
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Manufacturer:
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Figure 11-2. Power Fail Detect
4235K–8051–05/08
VPFDP
VPFDM
Vcc
Vcc
Reset
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 levels 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.
.
AT89C51RD2/ED2
t
29