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T89C51RC2-3CSIM Datasheet(PDF) 8 Page - ATMEL Corporation |
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T89C51RC2-3CSIM Datasheet(HTML) 8 Page - ATMEL Corporation |
8 / 117 page 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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