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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: 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
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.