The µPD78P324 is a product in which the µPD78324’s internal mask ROM is replaced by a one-time PROM or EPROM. The one-time PROM product, which enables writing only once, is effective for multiple-device small production of sets or early start of mass-production. The EPROM product, which enables program writing, deletion, and rewriting, is the most suitable for system evaluation.
The µPD78P324(A) is more reliable than the µPD78P324. The µPD78P324(A) is a product resulting from the µPD78324(A) whose internal mask ROM is replaced by a one-time PROM.
For details of functions, please refer to the following User’s Manual. Reading this manual is indispensable especially for designing work.

FEATURES
● µPD78324 compatible
   • For mass-production, this can be replaced by the µPD78324 incorporated in the mask ROM.
● Minimum instruction run time: 250 ns (with the external clock operating at 16 MHz): µPD78P324 & 78P324(A)
                                                   320 ns (with the external clock operating at 12.5 MHz): µPD78P324(A1) & 78P324(A2)
● Internal PROM: 32768 x 8 bits
   • Writing enabled only once (windowless one-time PROM product)
   • Elimination by ultraviolet light and electrical rewriting enabled (EPROM product with window): µPD78P324 only
● ECC circuit incorporated
   • High internal PROM content reliablility possible
● PROM programming characteristic: µPD27C1001A compatible
● QTOPTM microcomputer compatible
Remark A QTOP microcomputer is a single-chip microcomputer with one-time PROM for which program writing, marking, screening, and verifying is completely supported by NEC.

APPLICATION FIELDS
● µPD78P324: Fields dealing with motor control equipment.
● µPD78P324(A), 78P324(A1), and 78P324(A2): Automotive and transportation equipments, etc.