Rev. 1.0, 02/00, page 123 of 1141
Section 7 ROM
7.1
Overview
The H8S/2199 has 128 kbytes of on-chip ROM (flash memory or mask ROM), the H8S/2198 has
112 kbytes, the H8S/2197 has 96 kbytes, and the H8S/2196 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/2199 can be erased and programmed on-board as well as
with a general-purpose PROM programmer.
Note: * For details on product line-up, refer to section 1, Overview.
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
H'000001
H'000003
H'01FFFF
Figure 7.1 ROM Block Diagram (H8S/2199)