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H838024 bảng dữ liệu(PDF) 97 Page - Renesas Technology Corp

tên linh kiện H838024
Giải thích chi tiết về linh kiện  Renesas 8-Bit Single-Chip Microcomputer Super Low Power Series
PDF  697 Pages
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nhà sản xuất  RENESAS [Renesas Technology Corp]
Trang chủ  http://www.renesas.com
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H838024 bảng dữ liệu(HTML) 97 Page - Renesas Technology Corp

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Section 2 CPU
Rev. 7.00 Mar 10, 2005 page 55 of 652
REJ09B0042-0700
2.6
Basic Operational Timing
CPU operation is synchronized by a system clock (
φ) or a subclock (φ
SUB). For details on these
clock signals see section 4, Clock Pulse Generators. 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 2.11 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)
φ or φSUB
Figure 2.11 On-Chip Memory Access Cycle



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