Section 7 Rom (H8S/2194 Series); Overview; Block Diagram - Renesas Hitachi H8S/2194 Series Hardware Manual

Section 7 ROM (H8S/2194 Series)

7.1

Overview

The H8S/2194 has 128 kbytes of on-chip ROM (flash memory or mask ROM), the H8S/2193 has
112 kbytes, the H8S/2192 has 96 kbytes, and the H8S/2191 has 80 kbytes. The ROM is
connected to the CPU by a 16-bit data bus. The CPU accesses both byte and word data in one
state, enabling faster instruction fetches and higher processing speed.
The flash memory versions of the H8S/2194 can be erased and programmed on-board as well as
with a general-purpose PROM programmer.
7.1.1

Block Diagram

Figure 7.1 shows a block diagram of the ROM.
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
H'000000
H'000002
H'01FFFE
Figure 7.1 ROM Block Diagram (H8S/2194)
H'000001
H'000003
H'01FFFF
Rev. 2.0, 11/00, page 123 of 1037