Section 6 Rom; Overview; Block Diagram - Renesas F-ZTAT H8 Series Hardware Manual

8-bit single-chip microcomputer

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The H8/3857 has 60 kbytes of on-chip flash memory or mask ROM, while the H8/3856 has 48

kbytes, and the H8/3855 40 kbytes, of on-chip mask ROM. The H8/3854 has 60 kbytes of on-chip

flash memory or 32 kbytes of on-chip mask ROM, while the H8/3853 has 24 kbytes, and the

H8/3852 16 kbytes, of on-chip mask ROM. Note that the H8/3854 flash memory and mask ROM

versions have different ROM sizes. The ROM is connected to the CPU by a 16-bit data bus,

allowing high-speed 2-state data access for both byte data and word data.

With the flash memory versions (H8/3857F, H8/3854F), programs can be written and erased and

programmed either with a general-purpose PROM programmer or on-board.

When carrying out program development using the H8/3854F with the intention of mask ROM

implementation, care must be taken with ROM and RAM sizes since the maximum sizes for the

mask ROM version are 32 kbytes of ROM and 1 kbyte of RAM.

Figure 6.1 shows a block diagram of the on-chip ROM.

Section 6 ROM

Internal data bus (upper 8 bits)

Internal data bus (lower 8 bits)

Even-numbered

Figure 6.1 ROM Block Diagram (60 kbytes)

Odd-numbered

Rev.3.00 Jul. 19, 2007 page 119 of 532

REJ09B0397-0300