HCD404669

www.DataSheet4U.com 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 HD407A4669 is a ZTAT™ microcomputer with on-chip PROM that drastically shortens development time and ensures a smooth transition from debugging to mass production. (The PROM programming specifications are the same as for the 27256 type.) ZTAT™: Zero Turn-Around Time ZTAT is a trademark of Hitachi, Ltd. Features 1,152-digit × 4-bit RAM I/O pins: 47  High-current I/O pins (source: 10 mA max.): 4  High-current I/O pins (sink: 15 mA max.): 5 Timer counters: 3 Input capture: one 8-bit channel Timer outputs: 2 (with PWM output capability) Event input: 1 (edge-programmable) Clock synchronous 8-bit serial interface: 1 DTMF generation circuit Comparator: 2 channels System clock oscillator Ceramic oscillator, crystal oscillator, or external clock operation possible HD404669 S...