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M-Station Baseboard
4.7
LCD Socket
An optional pin socket can be mounted on row 8[23:31] and row 12, where an LCD module can be
inserted. The segment drive signals for the microcontroller CPU are connected to row 8[23:31] and
row 12. These pins are open for the CPUs, which do not support LCD segment drive.
4.8
Optional Expansion Memory
Optional footprints for 64 KB external expansion SRAM and its address latch are provided. The
address, data, and read/write control signals are connected to row 3 and are normally connected to
address, data and control lines through solder blobs.
Description
Address and data
Address
Address latch
Read
Write
Row 3 is free for other use if the optional memory and its address latch are not mounted. If, however,
the optional memory is mounted, the selected row 3 is dedicated for the external expansion memory.
To disconnect row 3 from external expansion memory after the memory is mounted, remove the 0Ω
resistors mounted on the solder blobs instead of removing memory.
Figure 12.
Four-Digit, Seven Segment LCD Module
Opt
ional Expansion Memory Signals on ROW3
Table 1
0.
Name
AD[0:7]
A[8:15]
ADDR_LD
SRAM_RDB
SRAM_WRB
Row
Connection
ROW3[16:24]
Through SB[17:10]
ROW3[25:32]
Through SB[9:2]
ROW3[16]
Through SB[18]
ROW3[13]
Through SB[21]
ROW3[14]
Through SB[20]
16
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