HD6432633 Datasheet, PDF (945/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

Section 21 RAM
21.1 Overview
The H8S/2633 and H8S/2633R have 16 kbytes of on-chip high-speed static RAM, the H8S/2632
has 12 kbytes, and the H8S/2631 and H8S/2695 have 8 kbytes. The RAM is connected to the CPU
by a 16-bit data bus, enabling one-state access by the CPU to both byte data and word data. This
makes it possible to perform fast word data transfer.
The on-chip RAM can be enabled or disabled by means of the RAM enable bit (RAME) in the
system control register (SYSCR).
21.1.1 Block Diagram
Figure 21-1 shows a block diagram of the on-chip RAM.
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
H'FFB000
H'FFB002
H'FFB004
H'FFB001
H'FFB003
H'FFB005
H'FFEFBE
H'FFFFC0
H'FFEFBF
H'FFFFC1
H'FFFFFE
H'FFFFFF
Figure 21-1 Block Diagram of RAM (H8S/2633 Series and H8S/2633R)
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