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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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TP80C251SP16 데이터시트(PDF) 13 Page - Intel Corporation |
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TP80C251SP16 데이터시트(HTML) 13 Page - Intel Corporation |
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13 / 36 page  PRELIMINARY 13 8XC251SA/SB/SP/SQ HIGH-PERFORMANCE CHMOS MICROCONTROLLER Table 7. Memory Signal Selections (RD1:0) RD1:0 P1.7/CEX/ A17/WCLK P3.7/RD#/A16 PSEN# WR# Features 0 0 A17 A16 Asserted for all addresses Asserted for writes to all memory locations 256-Kbyte external memory 0 1 P1.7/CEX4/ WCLK A16 Asserted for all addresses Asserted for writes to all memory locations 128-Kbyte external memory 1 0 P1.7/CEX4/ WCLK P3.7 only Asserted for all addresses Asserted for writes to all memory locations 64-Kbyte external memory. One additional port pin. 1 1 P1.7/CEX4/ WCLK RD# asserted for addresses ≤ 7F:FFFFH Asserted for ≥ 80:0000H Asserted only for writes to MCS 51 microcontroller data memory locations. 64-Kbyte external memory. Compatible with MCS 51 micro- controllers. |
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