MITSUBISHI MICROCOMPUTERS ,M37420M4-XXXSP M37420M6-XXXSP SINGLE·CHIP a·BIT CMOS MICROCOMPUTER DESCRIPTION The M37420M4-XXXSP and the M37420M6-XXXSP are single-chip microcomputers designed with CMOS silicon gate technology.
All are housed in a 52-pin shrink plastic molded DIP.
These single-chip microcomputers are useful for household appliance and other consumer applications.
In addition to its simple instruction sets, the ROM, RAM, and I/O addresses are placed on the same memory map to enable easy programming, The differences between the M37420M4-XXXSP and the M37420M6-XXXSP are noted below.
The following explanations apply to the M37420M6-XXXSP.
Specification variations for other chips are...

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