Section 7 Ram; Overview; Block Diagram - Renesas H8/38024 Hardware Manual

7.1

Overview

The H8/38024, H8/38023, H8/38022, H8/38124, H8/38123, H8/38122, H8/38024S, H8/38023S,
and H8/38022S have 1 Kbyte of high-speed static RAM on-chip, and the H8/38021, H8/38020,
H8/38121, H8/38120, H8/38021S, and H8/38020S have 512 bytes. 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.
Note: Mask ROM versions of the H8/38124, H8/38123, H8/38122, H8/3811, and H8/38120 are
under development.
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 (H8/38024)
H'FB81
H'FB83
H'FF7F
Odd-numbered
address
Rev. 6.00, 08/04, page 185 of 628