HD6413308 Hitachi Semiconductor, HD6413308 Datasheet - Page 251

• Manufacturer Part Number: HD6413308
• Description: Hitachi Single-Chip MicroComputer
• Manufacturer: Hitachi Semiconductor

13.1 Overview
The H8/330 includes 16K bytes of high-speed, on-chip ROM. The on-chip ROM is connected to
the CPU via a 16-bit data bus. Both byte data and word data are accessed in two states, enabling
rapid data transfer and instruction fetching.
The H8/330 is available in two versions: one with electrically programmable ROM (PROM); the
other with masked ROM. The PROM version has a PROM mode in which the chip can be
programmed with a standard PROM writer.
The on-chip ROM is enabled or disabled depending on the MCU operating mode, which is
determined by the inputs at the mode pins (MD
state. See table 13-1.
Table 13-1. On-Chip ROM Usage in Each MCU Mode
Mode
Mode 1 (expanded mode)
Mode 2 (expanded mode)
Mode 3 (single-chip mode)
Mode pins
MD
0
1
1
Section 13. ROM
1
MD
1
0
1
1
241
and MD
0
0
) when the chip comes out of the reset
On-chip ROM
Disabled (external addresses)
Enabled
Enabled