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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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HD64F2149YV 데이터시트(PDF) 715 Page - Renesas Technology Corp |
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HD64F2149YV 데이터시트(HTML) 715 Page - Renesas Technology Corp |
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715 / 1075 page  Section 22 ROM Rev. 3.00 Jan 18, 2006 page 687 of 1044 REJ09B0280-0300 Section 22 ROM 22.1 Overview The H8S/2169 or H8S/2149 has 64 kbytes of on-chip ROM (flash memory). The ROM is connected to the bus master by a 16-bit data bus. The bus master accesses both byte and word data in one state, enabling faster instruction fetches and higher processing speed. The mode pins (MD1 and MD0) and the EXPE bit in MDCR can be set to enable or disable the on-chip ROM. The chip can be erased and programmed on-board as well as with a general-purpose PROM programmer. 22.1.1 Block Diagram Figure 22.1 shows a block diagram of the ROM. H'000000 H'000002 H'00FFFE H'000001 H'000003 H'00FFFF Internal data bus (upper 8 bits) Internal data bus (lower 8 bits) Figure 22.1 ROM Block Diagram |
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