HD6412350 Hitachi, HD6412350 Datasheet - Page 676

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

18.2
The on-chip ROM is connected to the CPU by a 16-bit data bus, and both byte and word data can
be accessed in one state. Even addresses are connected to the upper 8 bits, and odd addresses to
the lower 8 bits. Word data must start at an even address.
The on-chip ROM is enabled and disabled by setting the mode pins (MD
settings are shown in table 18-1.
In normal mode, a maximum of 56 kbytes of ROM can be used.
Table 18-1 Operating Modes and ROM Area
Operating Mode
Mode 1 Normal expanded mode with
Mode 2 Normal expanded mode with
Mode 3 Normal single-chip mode
Mode 4 Advanced expanded mode with
Mode 5 Advanced expanded mode with
Mode 6 Advanced expanded mode with
Mode 7 Advanced single-chip mode
656
on-chip ROM disabled
on-chip ROM enabled
on-chip ROM disabled
on-chip ROM disabled
on-chip ROM enabled
Operation
MD
0
1
2
Mode Pin
MD
0
1
0
1
1
MD
1
0
1
0
1
0
1
0
2
On-Chip ROM
Disabled
Enabled (56 kbytes)
Disabled
Enabled
, MD
1
, and MD
0
). These