Section 8 Ram; Overview; Block Diagram - Hitachi H8/3664 Hardware Manual

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8.1

Overview

H8/3664 Series has 1 kbyte and 512 bytes of high-speed static RAM on-chip. The RAM is
connected to the CPU by a 16-bit data bus, allowing high-speed 2-state access for both byte data
and word data.
8.1.1

Block Diagram

Figure 8.1 shows a block diagram of the on-chip RAM.
H'FB80
H'FB82
H'FF7E

Section 8 RAM

Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
H'FB80
H'FB82
On-chip RAM
H'FF7E
Even-numbered
address
Figure 8.1 RAM Block Diagram
H'FB81
H'FB83
H'FF7F
Odd-numbered
address
137

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