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AT89C51RC2-3CSIM Datasheet(PDF) 12 Page - ATMEL Corporation

Part # AT89C51RC2-3CSIM
Description  Microcontroller with 16K/32K Bytes Flash
PDF  127 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT89C51RC2-3CSIM Datasheet(HTML) 12 Page - ATMEL Corporation

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12
AT89C51RB2/RC2
4180C–8051–12/03
PSEN
29
32
26
O
Program Strobe Enable: The read strobe to external program memory. When
executing code from the external program memory, PSEN is activated twice each
machine cycle, except that two PSEN activations are skipped during each access to
external data memory. PSEN is not activated during fetches from internal program
memory.
EA
31
35
29
I
External Access Enable: EA must be externally held low to enable the device to
fetch code from external program memory locations 0000H to FFFFH (RD). If
security level 1 is programmed, EA will be internally latched on Reset.
Table 12. Pin Description for 40 - 44 Pin Packages (Continued)
Mnemonic
Pin Number
Type
Name and Function
DIL
LCC
VQFP44 1.4



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