Section 7 Ram; Overview; Block Diagram - Renesas H8 Series Hardware Manual

7.1

Overview

The H8/3644 Group has 1 kbyte and 512 byte 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.
7.1.1

Block Diagram

Figure 7.1 shows a block diagram of the on-chip RAM.
H'FB80
H'FB82
H'FF7E

Section 7 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 7.1 RAM Block Diagram
H'FB81
H'FB83
H'FF7F
Odd-numbered
address
Rev. 6.00 Sep 12, 2006 page 167 of 526
Section 7 RAM
REJ09B0326-0600