NEC PD754144, PD754244 CHAPTER 1 GENERAL

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User’s Manual U10676EJ3V0UM
CHAPTER 1 GENERAL
The µ PD754144 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
µ PD754144 and 754244 have extended CPU functions compared to the µ PD75048, 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
µ PD754144 are as follows:
• Low-voltage operation: VDD = 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
µ PD754144: RC oscillator (resistors and capacitors are externally provided)
4, 8, 16, 64 µ s (at fCC = 1.0 MHz)
µ PD754244: Crystal/ceramic oscillator
0.95 µ s, 1.91 µ s, 3.81 µ s, 15.3 µ s (at fX = 4.19 MHz)
0.67 µ s, 1.33 µ s, 2.67 µ s, 10.7 µ s (at fX = 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
µ PD754244 (crystal/ceramic oscillation, fX) is treated as the representa-
tive model in this manual. When you use this manual for the
µ PD754144 (RC oscillation, fCC), take the
µ PD754244 as the µ PD754144 and fX as fCC.