HD6413308 Hitachi Semiconductor, HD6413308 Datasheet - Page 249
HD6413308
Manufacturer Part Number
HD6413308
Description
Hitachi Single-Chip MicroComputer
Manufacturer
Hitachi Semiconductor
Datasheet
1.HD6413308.pdf
(349 pages)
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12.1 Overview
The H8/330 includes 512 bytes 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’FD80 to H’FF7F in the chip’s address space. The
RAME bit in the system control register (SYSCR) can enable or disable the on-chip RAM,
permitting these addresses to be allocated to external memory instead, if so desired.
12.2 Block Diagram
Figure 12-1 is a block diagram of the on-chip RAM.
12.3 RAM Enable Bit (RAME)
The on-chip RAM is enabled or disabled by the RAME (RAM Enable) bit in the system control
register (SYSCR). Table 12-1 lists information about the system control register.
Address
H'FD80
H'FD82
H'FF7E
Figure 12-1. Block Diagram of On-Chip RAM
Even address
Section 12. RAM
Internal data bus (upper 8 bits)
Internal data bus (lower 8 bits)
H'FD80
H'FD82
H'FF7E
On-chip RAM
239
Odd address
H'FD81
H'FD83
H'FF7F
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