HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 178

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

7.1
The H8/3644 Series has 1 kbyte and 512 byte of high-speed static RAM on-chip. 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.
7.1.1
Figure 7-1 shows a block diagram of the on-chip RAM.
Overview
Block Diagram
H'FF7E
H'FB80
H'FB82
Even-numbered
Figure 7-1 RAM Block Diagram
Internal data bus (upper 8 bits)
address
Internal data bus (lower 8 bits)
H'FF7E
H'FB80
H'FB82
Section 7 RAM
On-chip RAM
Odd-numbered
address
H'FB81
H'FB83
H'FF7F
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