HD6412350 Hitachi, HD6412350 Datasheet - Page 675

• Manufacturer Part Number: HD6412350
• Description: (HD6412350 / HD6432351) 16-BIT MICROCONTROLLER
• Manufacturer: Hitachi

18.1
The H8S/2351 has 64 kbytes of on-chip ROM (mask ROM). The ROM is connected to the
H8S/2000 CPU by a 16-bit data bus. The CPU accesses both byte data and word data in one state,
making possible rapid instruction fetches and high-speed processing.
The on-chip ROM is enabled or disabled by setting the mode pins (MD
EAE in BCRL.
18.1.1
Figure 18-1 shows a block diagram of the on-chip ROM.
Overview
Block Diagram
Section 18 ROM (H8S/2351 Only)
Figure 18-1 Block Diagram of ROM (H8S/2351)
H'00FFFE
H'000000
H'000002
H'000004
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
H'00FFFF
H'000001
H'000003
H'000004
2
, MD
1
, and MD
0
) and bit
655