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HD404669 Datasheet, PDF (1/142 Pages) Hitachi Semiconductor – Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit | |||
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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 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.)
ZTATâ¢: Zero Turn-Around Time ZTAT is a trademark of Hitachi, Ltd.
Features
⢠1,152-digit à 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
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