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T89C51RC2-3CSIM Scheda tecnica(PDF) 8 Page - ATMEL Corporation

Il numero della parte T89C51RC2-3CSIM
Spiegazioni elettronici  8-bit Microcontroller with 16K/ 32K Bytes Flash
PDF  117 Pages
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Produttore elettronici  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T89C51RC2-3CSIM Scheda tecnica(HTML) 8 Page - ATMEL Corporation

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8
T89C51RB2/RC2
4105D–8051–10/06
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 3. Pin Description for 40 - 44 Pin Packages (Continued)
Mnemonic
Pin Number
Type
Name and Function
DIL
LCC
VQFP44 1.4



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