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HD6433636SW Datasheet(PDF) 56 Page - Renesas Technology Corp |
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HD6433636SW Datasheet(HTML) 56 Page - Renesas Technology Corp |
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56 / 418 page  42 2.6 Basic Operational Timing CPU operation is synchronized by a system clock (ø) or a subclock (ø SUB). For details on these clock signals see section 4, Clock Pulse Generators. The period from a rising edge of ø or ø SUB to the next rising edge is called one state. A bus cycle consists of two states or three states. The cycle differs depending on whether access is to on-chip memory or to on-chip peripheral modules. 2.6.1 Access to On-Chip Memory (RAM, ROM) Acess to on-chip memory takes place in two states. The data bus width is 16 bits, allowing access in byte or word size. Figure 2.11 shows the on-chip memory access cycle. T1 state Bus cycle T2 state Internal address bus Internal read signal Internal data bus (read access) Internal write signal Read data Address Write data Internal data bus (write access) SUB ø or ø Figure 2.11 On-Chip Memory Access Cycle |
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