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AT89C51RC2-3CSCM 查看數據表(PDF) - Atmel Corporation

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AT89C51RC2-3CSCM
Atmel
Atmel Corporation 
AT89C51RC2-3CSCM Datasheet PDF : 127 Pages
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Table 12. Pin Description for 40 - 44 Pin Packages (Continued)
Pin Number
Mnemonic
DIL
LCC VQFP44 1.4 Type Name and Function
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.
12 AT89C51RB2/RC2
4180E–8051–10/06

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