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PDF UPD754144GS Data sheet ( Hoja de datos )
| Número de pieza | UPD754144GS | |
| Descripción | 4-BIT SINGLE-CHIP MICROCONTROLLERS | |
| Fabricantes | NEC | |
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DATA SHEET
MOS INTEGRATED CIRCUIT
µPD754144, 754244
4-BIT SINGLE-CHIP MICROCONTROLLERS
DESCRIPTION
The µPD754244 is a 4-bit single-chip microcontroller which incorporates the EEPROMTM for key-less entry
application.
It incorporates a 16 × 8-bit EEPROM, a 4-Kbyte mask ROM to store software, a 128 × 4-bit RAM to store the
processing data, a processing CPU, and a carrier generator which easily outputs waveforms for infrared remote
controller.
The details of functions are described in the following user’s manual. Be sure to read it before designing.
µPD754144, 754244 User’s Manual: U10676E
FEATURES
• On-chip EEPROM: 16 × 8 bits (mapped to the data memory)
• On-chip key return reset function for key-less entry
• System clock oscillation circuit
• µPD754144: RC oscillator (external resistor and capacitor)
• µPD754244: Crystal/ceramic oscillator
• Low-voltage operation: VDD = 1.8 to 6.0 V
• Timer function (4 channels)
• Basic interval timer/watchdog timer: 1 channel
• 8-bit timer counter
• On-chip memory
: 3 channels
• Program memory (ROM)
4096 × 8 bits
• Data memory (static RAM)
128 × 4 bits
• Instruction execution time variable function suited for power saving.
• µPD754144:
4, 8, 16, 64 µs (at fcc = 1.0-MHz operation)
• µPD754244:
0.95, 1.91, 3.81, 15.3 µs (at fx = 4.19-MHz operation)
0.67, 1.33, 2.67, 10.7 µs (at fx = 6.0-MHz operation)
APPLICATIONS
Automotive appliances such as key-less entry, compact data carrier, etc.
Unless contextually excluded, references in this data sheet to the µPD754244 (crystal/ceramic oscillation: fX)
mean the µPD754144.
The µPD754144 and µPD754244 differ in the notation of their RC oscillation: whenever fX (RC oscillation notation
for µPD754244) is described, fCC should be substituted for the µPD754144.
Document No. U10040EJ2V0DS00
Date Published July 1998 N CP(K)
Printed in Japan
The information in this document is subject to change without notice.
The mark shows major revised points.
©
1995
1 page  
µPD754144, 754244
15. RC OSCILLATION FREQUENCY CHARACTERISTICS EXAMPLES (REFERENCE VALUES) ..... 72
16. PACKAGE DRAWINGS ...................................................................................................................... 76
17. RECOMMENDED SOLDERING CONDITIONS .................................................................................. 78
APPENDIX A. COMPARISON OF FUNCTIONS AMONG µPD754144, 754244, AND 75F4264 ........... 80
APPENDIX B. DEVELOPMENT TOOLS ................................................................................................. 81
APPENDIX C. RELATED DOCUMENTS ................................................................................................84
5
5 Page 
µPD754144, 754244
3.3 Pin Input/Output Circuits
The µPD754244 pin input/output circuits are shown schematically.
TYPE A
TYPE D
VDD
P-ch
IN
N-ch
data
output
disable
VDD
P-ch
OUT
N-ch
CMOS specification input buffer.
TYPE B
IN
Schmitt-trigger input having hysteresis characteristic.
Push-pull output that can be placed in output
high-impedance (both P-ch, N-ch off).
TYPE E-B
data
output
disable
P.U.R.
enable
Type D
VDD
P.U.R.
P-ch
IN/OUT
Type A
TYPE B-A
VDD
P.U.R. (Mask Option)
IN
P.U.R. : Pull-Up Resistor
P.U.R. : Pull-Up Resistor
TYPE F-A
data
output
disable
P.U.R.
enable
Type D
VDD
P.U.R.
P-ch
IN/OUT
Type B
P.U.R. : Pull-Up Resistor
11
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