描述 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.

特性 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