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