WD4020 microcontrollers equivalent, romless n-channel microcontrollers.
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 INST.
or when the program may require
changing.
FIGURE 2 WD4020 BLOCK DIAGRAM
487
Pin No. 1 2 3,5,6,7,8, 9,10.36 4 11,12,1.
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 ge.
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