D12320VF25IV Datasheet, PDF (763/1304 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

Section 18 RAM
Section 18 RAM
18.1 Overview
The H8S/2329B and H8S/2324S have 32 kbytes of on-chip high-speed static RAM, the H8S/2328
(H8S/2328B in flash memory version), H8S/2327, H8S/2326, H8S/2323, and H8S/2322R have 8
kbytes, and the H8S/2321 and H8S/2320 have 4 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).
18.1.1 Block Diagram
Figure 18.1 shows a block diagram of 32 kbytes of on-chip RAM.
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
H'FF7C00
H'FF7C02
H'FF7C04
H'FF7C01
H'FF7C03
H'FF7C05
H'FFFBFE
H'FFFBFF
Figure 18.1 Block Diagram of RAM (32 kbytes)
Rev.6.00 Sep. 27, 2007 Page 731 of 1268
REJ09B0220-0600