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Functional Specifications
2.3 Memory
Rev.1.00
Oct 09, 2008 2-4
REJ11J0021-0100
2
2.3 Memory
2.3.1 SH7137 Internal Memory
The SH7137 MCU is provided with a 256-KB flash memory and a 16-KB RAM.
2.3.2 SRAM
A 32-KB of SRAM can be mounted on the M3A-HS37 (optional). Both 5 V and 3.3 V can be supplied for the CPU and the
SRAM on the M3A-HS37. The supply voltage supplied to the CPU is also supplied to SRAM. When M5M5256DFP-70GI is
mounted as SRAM, the supply voltage is automatically the same as the CPU. The SRAM is controlled by the SH7137 on-chip
bus state controller.
Table 2.3.1 lists the SRAM specifications. Figure 2.3.1 shows the block diagram of the connection between the SH7137 and
SRAM. Table 2.3.2 lists the jumper connections.
Table 2.3.1 SRAM Specifications
Part Number Bus size Capacity Package
M5M5256DFP-70GI
8-bit 32 KB (bus width: 8-bit) 28-pin SOP (450 mil)
Figure 2.3.1 Connection Diagram Between SH7137 and SRAM
Table 2.3.2 Jumper Connections
SCI0 SCI1 SRAM JP7 JP8 JP9 JP10
Y N Y 2-3 2-3 2-3 2-3
N Y N 1-2 1-2 1-2 1-2
Note: Y = yes, N = no