Section 7 Ram; Overview; Block Diagram - Renesas F-ZTAT H8 Series Hardware Manual

8-bit single-chip microcomputer

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The H8/3857 Group and the H8/3854 flash memory version have 2 kbytes of high-speed on-chip

static RAM, and the H8/3854 Group mask ROM version has 1 kbyte. The RAM is connected to

the CPU by a 16-bit data bus, allowing high-speed 2-state access for both byte data and word data.

Note that the H8/3854 flash memory and mask ROM versions have different ROM and RAM

Figure 7.1 shows a block diagram of the on-chip RAM.

Note: * This is the start address for 2-kbyte RAM. With 1-kbyte RAM, the start address is H'FB80

and the RAM area is from H'FB80 to H'FF7E.

Section 7 RAM

Internal data bus (upper 8 bits)

Internal data bus (lower 8 bits)

Even-numbered

Figure 7.1 RAM Block Diagram

Odd-numbered

Rev.3.00 Jul. 19, 2007 page 167 of 532

REJ09B0397-0300