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T89C51RB2-3CSIM 데이터시트(PDF) 8 Page - ATMEL Corporation

부품명 T89C51RB2-3CSIM
상세설명  8-bit Microcontroller with 16K/ 32K Bytes Flash
PDF  117 Pages
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제조업체  ATMEL [ATMEL Corporation]
홈페이지  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

T89C51RB2-3CSIM 데이터시트(HTML) 8 Page - ATMEL Corporation

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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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