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4508 Datasheet(PDF) 18 Page - Renesas Technology Corp |
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4508 Datasheet(HTML) 18 Page - Renesas Technology Corp |
18 / 142 page Rev.1.02 2006.12.22 page 18 of 140 REJ03B0148-0102 4508 Group 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. 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 M34508G4 M34508G4H RAM size 256 words ✕ 4 bits (1024 bits) 256 words ✕ 4 bits (1024 bits) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 0 0 1 7 23 6 ... 15 ........ Register Z Register X RAM 256 words ✕ 4 bits (1024 bits) |
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