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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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4584 数据表(PDF) 21 Page - Renesas Technology Corp |
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4584 数据表(HTML) 21 Page - Renesas Technology Corp |
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21 / 157 page  Rev.3.00 2004.08.06 page 21 of 155 REJ03B0010-0300Z 4584 Group PRELIMINARY Notice: This is not a final specification. Some parametric limits are subject to change. DATA MEMORY (RAM) 1 word of RAM is composed of 4 bits, but 1-bit manipulation (with the SB j, RB j, and SZB j instructions) is enabled for the entire memory area. A RAM address is specified by a data pointer. The data pointer consists of registers Z, X, and Y. Set a value to the data pointer certainly when executing an instruction to access RAM (also, set a value after system returns from RAM back-up). Table 2 shows the RAM size. Figure 12 shows the RAM map. • Note Register Z of data pointer is undefined after system is released from reset. Also, registers Z, X and Y are undefined in the RAM back-up. After system is returned from the RAM back-up, set these registers. Fig. 12 RAM map Table 2 RAM size Part number M34584MD/ED RAM size 384 words ✕ 4 bits (1536 bits) M34584MD/ED Z=0, X=0 to 15 Z=1, X=0 to 7 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 0 1 ... 7 1 23 6 567 0 15 ... ... ... ... 384 words Register Z Register X RAM 384 words ✕ 4 bits (1536 bits) |
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