h8s-2138 Renesas Electronics Corporation., h8s-2138 Datasheet - Page 627

• Manufacturer Part Number: h8s-2138
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2100 Series
• Manufacturer: Renesas Electronics Corporation.

20.1
The H8S/2138, H8S/2134, and H8S/2133 have 4 kbytes of on-chip high-speed static RAM, and
the H8S/2137, H8S/2132, and H8S/2130 have 2 kbytes. The on-chip RAM is connected to the
CPU by a 16-bit data bus, enabling both byte data and word data to be accessed in one state. 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).
20.1.1
Figure 20.1 shows a block diagram of the on-chip RAM.
Overview
Block Diagram
Figure 20.1 Block Diagram of RAM (H8S/2138, H8S/2134, H8S/2133)
H'FFEFFE
H'FFFF7E
H'FFE080
H'FFE082
H'FFE084
H'FFFF00
Section 20 RAM
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
H'FFEFFF
H'FFFF7F
H'FFE081
H'FFE083
H'FFE085
H'FFFF01
Rev. 4.00 Jun 06, 2006 page 573 of 1004
REJ09B0301-0400
Section 20 RAM