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AT89C51ED2-RDTUM Datasheet(PDF) 25 Page - ATMEL Corporation

Part # AT89C51ED2-RDTUM
Description  8-bit Flash Microcontroller
PDF  137 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51ED2-RDTUM Datasheet(HTML) 25 Page - ATMEL Corporation

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25
4235K–8051–05/08
AT89C51RD2/ED2
Reset Value = 0X00 1000
Not bit addressable
1
EXTRAM
EXTRAM bit
Cleared to access internal XRAM using movx @ Ri/ @ DPTR.
Set to access external memory.
Programmed by hardware after Power-up regarding Hardware Security Byte (HSB),
default setting, XRAM selected.
0
AO
ALE Output bit
Cleared, ALE is emitted at a constant rate of 1/6 the oscillator frequency (or 1/3 if X2
mode is used). (default) Set, ALE is active only during a MOVX or MOVC instruction is
used.
Bit
Number
Bit
Mnemonic
Description



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