NEC PD754144 - Manual (Page 17)

17 User’s Manual U10676EJ3V0UM
CHAPTER 1 GENERAL
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))
APPLICATIONS
• Automotive appliances such as keyless entry, small data carriers, etc.
Remark 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 .