DATA SHEET
MOS INTEGRATED CIRCUIT
µPD78P078
8-BIT SINGLE-CHIP MICROCONTROLLER
DESCRIPTION
The µPD78P078 is a member of the µPD78078 Subseries of the 78K/0 Series, in which the on-chip mask ROM of
the µPD78078 is replaced with a one-time PROM or EPROM.
Because this device can be programmed by users, it is ideally suited for system evaluation, small-lot and multipledevice production, and early development and time-to-market.
The µPD78P078 can be used for evaluation when a system using the µPD78075B Subseries is developed.
The µPD78075B Subseries is different from the µPD78078 Subseries in specification. To use the
Caution
µPD78P078 for evaluation of the µPD78075B Subseries, refer to µPD78075B, 78075BY Subseries
User’s Manual (planned).
The details of functions are described in the user’s manuals. Be sure to read the following manuals before
designing.
µPD78078, 78078Y Subseries User’s Manual: U10641E
78K/0 Series User’s Manual Instructions:
U12326E
FEATURES
• Pin-compatible with mask ROM version
• Internal high-speed RAM: 1 024 bytes
(except VPP pin)
Note 1
• Internal PROM: 60 Kbytes
• Internal expansion RAM: 1 024 bytesNote 2
• Internal buffer RAM: 32 bytes
• Operable in the same supply voltage as the mask ROM
version (VDD = 1.8 to 5.5 V)
TM
• Corresponding to QTOP microcontrollers
Notes 1. The internal PROM capacity can be changed by setting the memory size switching register (IMS).
2. The internal expansion RAM capacity can be changed by the internal expansion RAM size switching
register (IXS).
Remarks 1. Refer to 1. DIFFERENCES BETWEEN µPD78P078 AND MASK ROM VERSIONS for the
differences between the PROM version and the mask ROM version.
2. QTOP microcontroller is a general term for microcontrollers which incorporate one-time PROM and
are totally supported by NEC’s programming service (from programming to marking, screening and
verification).
The information in this document is subject to change without notice. Before using this document, please
confirm that this is the latest version.
Not all products and/or types are available in every country. Please check with an NEC Electronics
sales representative for availability and additional information.
Document No. U10168EJ3V1DS00 (3rd edition)
Date Published August 2005 N CP (K)
Printed in Japan
The mark
shows major revised points.
1995
