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2
2.3 Memory
The M3A-HS64 includes the SH7264 internal RAM, an external flash memory, an external SDRAM, and an external EEPROM.
2.3.1 SH7264 Internal RAM
The SH7264 includes 64 KB internal RAM that allows high-speed access to MCU, and a 1 MB large-capacity internal RAM of
which 32-KB is used for data retention.
2.3.2 NOR Flash Memory Interface
The M3A-HS64 comes standard with an NOR flash memory listed in the table below to store the user program.
The NOR flash memory works at 16-bit mode, and 3.3 V-only single power supply. It is write-protected or write-enabled by system
setting DIP switches. The figure below shows the NOR flash memory block diagram. Table 2.3.2 lists the DIP switches setting
(SW6-1).
Part Number
S29GL032N90TFI020
Rev. 1.00 Apr 30, 2009
REJ11J0034-0100
Table 2.3.1 NOR Flash Memory Specifications
Bus Size
16-bit
4 MB (16-bit x 2 M Words x 1)
Figure 2.3.1 NOR Flash Memory Block Diagram
M3A-HS64 Functions
Capacity
2.3 Memory
Access Time
90 ns
2-12
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