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H838532H bảng dữ liệu(PDF) 67 Page - Renesas Technology Corp

tên linh kiện H838532H
Giải thích chi tiết về linh kiện  16-Bit Single-Chip Microcomputer H8 Family / H8/300H Super Low Power Series
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nhà sản xuất  RENESAS [Renesas Technology Corp]
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Section 2 CPU
Rev. 1.00 May 30, 2008 Page 47 of 484
REJ09B0436-0100
2.6
Basic Bus Cycle
CPU operation is synchronized by a system clock (
φ) or a subclock (φ
SUB). The period from a rising
edge of
φ or φ
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)
Access to on-chip memory takes place in two states. The data bus width is 16 bits, allowing access
in byte or word size. Figure 2.9 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
φor φ
Figure 2.9 On-Chip Memory Access Cycle



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