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HD404669 Series
Low-
Voltage AS Microcomputers with On-Chip DTMF Generation Circuit
ADE-202-083B Rev.
3.
0 Sept.
1999 Description
The HD404669 Series microcomputers incorporate a DTMF generation circuit, two comparators, and a serial interface on chip.
They also provide input and output pins with large current handling capacities.
Thus they are 4-bit single-chip microcomputers that are optimal for use in multifunction telephones, cordless telephones, and other communications equipment.
HD404669 Series microcomputers have a 32.
768 kHz sub-oscillator for realtime clock use, providing a time counting facility, and a variety of power supply modes to reduce current drain.
The ...