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What is UPD7554?

This electronic component, produced by the manufacturer "NEC", performs the same function as "4-BIT SINGLE-CHIP MICROCOMPUTER".


UPD7554 Datasheet PDF - NEC

Part Number UPD7554
Description 4-BIT SINGLE-CHIP MICROCOMPUTER
Manufacturers NEC 
Logo NEC Logo 


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DATA SHEET
MOS INTEGRATED CIRCUIT
µPD7554A, 7554A(A)
4-BIT SINGLE-CHIP MICROCOMPUTER
DESCRIPTION
The µPD7554A is a product of the µPD7554, 7564 sub-series which is a 4-bit single-chip microcomputer with a
small number of ports in a small package, which is enabled to operate even at the super-low voltage of 2.0 V so
that it is optimized for handy-type systems operating with dry cells. The µPD7554A is a low-order model in the
µPD7500 series (µPD7554A only).
This device incorporates a serial interface, and serves as the sub-CPU for a high-order model of that series or
the 8-bit microcomputer. It is optimized for distributed processing of the system.
The µPD7554A has outputs to directly drive a triac and LEDs and allows selection among many types of input/
output circuits using their respective mask options, sharply reducing the number of external circuits required.
Details of functions are described in the User’s Manual shown below. Be sure to read in design.
µPD7554, 7564 User’s Manual: IEM-1111D
FEATURES
Range of supply voltage 7554A : 2.0 to 6.0 V
7554A(A) : 2.7 to 6.0 V
Drive with two 1.5 V manganese cells
47 types of instructions
(Subset of µPD7500H SET B)
Instruction cycle
External clock : 2.86 µs (in operation at 700 kHz, 5 V)
RC oscillation : 4 µs (in operation at 500 kHz, 5 V)
Program memory (ROM) capacity: 1024 × 8 bits
Data memory (RAM) capacity: 64 × 4 bits
Test source: One external source and two internal
sources
8-bit timer/event counter
16 I/O lines (Total output current of all pins: 100 mA)
• Can directly drive a triac and a LED: P80 to P83
• Can directly drive LEDs: P100 to P103 and P110
to P113
• Mask option function provided for every port
8-bit serial interface
Standby (STOP/HALT) function
Low supply voltage data retaining function for data
memory
Built-in ceramic oscillator for system clock RC
Oscillation with an external resistor R (Incorporat-
ing capacitor C)
APPLICATION
µPD7554A : Sub-CPU including handy-type system, PPC, printer, VCR, audio equipments, etc.
µPD7554A(A) : Automotive and transportation equipments, etc.
5
5
The quality level and absolute maximum ratings of the µPD7554A and the µPD7554A(A) differ.
Except where specifically noted, explanations here concern the µPD7554A as a representative product.
If you are using the µPD7554A(A), use the information presented here after checking the functional differences.
Document No. IC-2419C
(O. D. No. IC-7835C)
Date Published January 1995 P
Printed in Japan
The information in this document is subject to change without notice.
The mark 5 shows major revised points.
© 198994

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UPD7554 equivalent
µPD7554A, 7554A(A)
APPENDIX A. COMPARISON BETWEEN SUB-SERIES PRODUCT FUNCTIONS..................................... 58
APPENDIX B. DEVELOPMENT TOOLS ........................................................................................................ 59
APPENDIX C. RELATED DOCUMENTS ........................................................................................................ 61 5
5


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