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Motore di ricerca datesheet componenti elettronici |
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Motore di ricerca datesheet componenti elettronici |
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H8S/2218 Scheda tecnica(PDF) 179 Page - Renesas Technology Corp |
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H8S/2218 Scheda tecnica(HTML) 179 Page - Renesas Technology Corp |
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179 / 750 page  Section 6 Bus Controller Rev.6.00 Jun. 03, 2008 Page 131 of 698 REJ09B0074-0600 6.5 Basic Timing The CPU is driven by a system clock ( φ), denoted by the symbol φ. The period from one rising edge of φ to the next is referred to as a "state." The memory cycle or bus cycle consists of one, two, or three states. Different methods are used to access on-chip memory, on-chip peripheral modules, and the external address space. 6.5.1 On-Chip Memory (ROM, RAM) Access Timing On-chip memory is accessed in one state. The data bus is 16 bits wide, permitting both byte and word transfer instruction. Figure 6.4 shows the on-chip memory access cycle. Figure 6.5 shows the pin states. T 1 φ Internal address bus Bus cycle Address Read data Write data Internal read signal Internal data bus Internal write signal Internal data bus Read access Write access Figure 6.4 On-Chip Memory Access Cycle |
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