HD6475328-CP10 HITACHI [Hitachi Semiconductor], HD6475328-CP10 Datasheet - Page 304

• Manufacturer Part Number: HD6475328-CP10
• Description: original Hitachi CMOS microcomputer unit (MCU)
• Manufacturer: HITACHI [Hitachi Semiconductor]

16.1 Overview
The H8/532 includes 1K byte of on-chip static RAM, connected to the CPU by a 16-bit data bus.
Both byte and word access to the on-chip RAM are performed in two states, enabling rapid data
transfer and instruction execution.
The on-chip RAM is assigned to addresses H'FB80 to H'FF7F in the chip’s address space. A
RAM control register (RAMCR) can enable or disable the on-chip RAM, permitting these
addresses to be allocated to external memory instead, if so desired.
16.1.1 Block Diagram
Figure 16-1 shows the block diagram of the on-chip RAM.
RAMCR: RAM Control Register
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
Address
H'FF7E
H'FB80
H'FB82
Figure 16-1 Block Diagram of On-Chip RAM
Even addresses
Section 16 RAM
On-chip RAM
291
Odd addresses
RAMCR