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PDF D78P014 Data sheet ( Hoja de datos )
| Número de pieza | D78P014 | |
| Descripción | UPD78P014 | |
| Fabricantes | NEC | |
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DATA SHEET
MOS INTEGRATED CIRCUIT
µPD78P014
8-BIT SINGLE-CHIP MICROCOMPUTER
DESCRIPTION
The µPD78P014 is a member of the µPD78014 subseries of 78K/0 series products. It uses a one-time-programmable
(OTP) ROM or EPROM instead of the mask ROM of the µPD78014.
Because the µPD78P014 can be programmed by users, it is ideally suited for applications involving the evaluation
of systems in development stages, small-scale production of many different products, and rapid development and time-
to-market of a new product.
Detailed information about product features and specifications can be found in the following document. Please
make sure to read this document before starting design.
µPD78014, 78014Y Series User’s Manual : IEU-1343
FEATURES
• Pin compatible with mask ROM versions (except VPP pin)
• Internal PROM: 32K bytesNote
• µPD78P014DW
: Reprogrammable (ideal for system evaluation)
• µPD78P014CW, 78P014GC-AB8 : Programmable once only (ideal for small-scale production)
• Internal high-speed RAM: 1024 bytesNote
• Buffer RAM: 32 bytes
• Operable over same supply voltage range as mask ROM version (2.7 to 6.0 V)
• Available for the QTOPTM microcomputer
Note The internal PROM and internal high-speed RAM size can be set by means of the memory size switching
register.
Remark The QTOP microcomputer is the general term for a single-chip microcomputer with on-chip one-time
PROM. NEC supports its program writing, marking, screening, and verification.
Differences from mask ROM versions are as follows:
• The same memory mapping as on a mask ROM version is possible by setting the memory size
switching register.
• There is no function for incorporating pull-up resistors by means of a mask option in P60 to P63
pins.
ORDERING INFORMATION
Part No.
µPD78P014CW
µPD78P014DW
µPD78P014GC-AB8
Package
64-pin plastic shrink DIP (750 mil)
64-pin ceramic shrink DIP (with window) (750 mil)
64-pin plastic QFP (14 × 14 mm)
Internal ROM
One-time PROM
EPROM
One-time PROM
In this document, the common parts of the one-time PROM version and EPROM version are represented by PROM.
Document No. IC-3098C
(O. D. No. IC-8111C)
Date Published January 1995 P
Printed in Japan
The information in this document is subject to change without notice.
The mark 5 shows revised points.
© 1992
1 page  
64-pin plastic QFP (14 × 14 mm)
µPD78P014
P30/TO0
P31/TO1
P32/TO2
P33/TI1
P34/TI2
P35/PCL
P36/BUZ
P37
VSS
P40/AD0
P41/AD1
P42/AD2
P43/AD3
P44/AD4
P45/AD5
P46/AD6
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
1 48
2 47
3 46
4 45
5 44
6 43
7 42
8 41
9 40
10 39
11 38
12 37
13 36
14 35
15 34
16 33
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
P11/ANI1
P10/ANI0
AVSS
P04/XT1
XT2
VPP
X1
X2
VDD
P03/INTP3
P02/INTP2
P01/INTP1
P00/INTP0/TI0
RESET
P67/ASTB
P66/WAIT
Cautions 1. VPP pin should be connected to VSS directly.
2. AVDD pin should be connected to VDD.
3. AVSS pin should be connected to VSS.
5
5 Page 
µPD78P014
1. DIFFERENCES BETWEEN µPD78P014 AND MASK ROM VERSION
The µPD78P014 incorporates one-time PROM which can be written to once only, or EPROM to which programs
can be written, erased and rewritten.
By setting the internal memory size switching register, it is possible to make the functions of this device, except
for the PROM specification and mask option for pins P60 to P63, identical to those of a mask ROM version.
The differences between µPD78P014 and mask ROM versions are shown in Table 1-1.
Table 1-1. Differences Between µPD78P014 and Mask ROM Version
Item
IC pin
VPP pin
Mask option for pins P60 to P63
µPD78P014
Mask ROM Version
No Yes
Yes No
No mask option for incorporation of pull- Pull-up resistor incorporation possible by
up resistor
means of mask option
Caution In the µPD78P014, the capacity of the internal PROM and internal high-speed RAM can be changed by using
the internal memory size switching register.
RESET input sets internal PROM to 32K bytes and internal high-speed RAM to 1K bytes.
11
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