Renesas Single-Chip Microcomputer M306NKT3 - Manual (Page 138)

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The FDM used a H8S/2148AF with an 18.432MHz crystal, but the E8 uses an H8S/2215UF with a 16MHz
crystal.
The numbering system above applies to the 14-pin FDM and E8. This numbering system does not apply to the
20-pin FDM connector.