NEC PD754244 Manuel D’Utilisation

User’s Manual  U10676EJ3V0UM

The 

µPD754144 and 754244 are 4-bit single-chip microcontrollers in the NEC 75XL Series, the successor to the

75X Series that boasts a wealth of variations.

The 

µPD754144 and 754244 have extended CPU functions compared to the µPD75048, a 75X Series product

with on-chip EEPROM, enabling high-speed and low voltage (1.8 V) operation.

This model is available in a small plastic SSOP (7.62 mm (300)).

The features of the 

µPD754144 are as follows:

•

Low-voltage operation: V

DD

 = 1.8 to 6.0 V

128-bit (16 

× 8 bits) EEPROM capable of low voltage (1.8 V) operation on chip

•

Variable instruction execution time useful for high-speed operation and power saving

µPD754144: RC oscillator (resistors and capacitors are externally provided)

4, 8, 16, 64 

µs (at f

CC

 = 1.0 MHz)

µPD754244: Crystal/ceramic oscillator

0.95 

µs, 1.91 µs, 3.81 µs, 15.3 µs (at f

X

 = 4.19 MHz)

0.67 

µs, 1.33 µs, 2.67 µs, 10.7 µs (at f

X

 = 6.0 MHz)

•

Four timer channels

•

Key return reset function for key-less entry

•

Small package (20-pin plastic SSOP (7.62 mm (300))

•

Automotive appliances such as keyless entry, small data carriers, etc.

Unless otherwise specified, the 

µPD754244 (crystal/ceramic oscillation, f

X

) is treated as the representa-

tive model in this manual.  When you use this manual for the 

µPD754144 (RC oscillation, f

CC

), take the

µPD754244 as the µPD754144 and f

X

 as f

CC

.