WD4020 Datasheet (Western Digital) - ROMless N-Channel Microcontrollers

WD4020, ROMless N-Channel Microcontrollers

System oscillalor output System oscillalor inpul 8 bidirectional ROM address and dala ports Syslem reset Input 8 bidirectional I/O ports with TRI-STATE® 4 general purpose Inputs Power supply Ground Serial input (or counter input) Serial output (or general purpose output) Logic-controlled clock (or g

WD4020 Features

* LOW COST EXACT CIRCUIT EQUIVALENT OF WD4200 STANDARD 40-PIN DUAL-IN-LINE PACKAGE INTERFACES WITH STANDARD PROM OR ROM 64 x 4 RAM, ADDRESSES UP TO lK x 8 ROM POWERFUL INSTRUCTION SET TRUE VECTORED INTERRUPT, PLUS RESTART THREE-LEVEL SUBROUTINE STACK 4.01's INSTRUCTION TIME SINGLE SUPPLY OPERATION (4.