Western Digital WD4020
The WD4020 ROMless Microcontrollers are members of the Control Oriented Processor (COP) family, fabricated using N-channel, silicon gate MOS technology. Each part contains CPU, RAM and 1/0, and is identical to a WD4200 device, except the ROM has been removed; pins have been added to output the ROM address to input ROM data. These devices are also appropriate in low volume applications, or when the program may require changing.
| Part No. |
WD4020 |
| Datasheet |
WD4020
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| Manufacturer |
 Western Digital |
| Description |
ROMless N-Channel Microcontrollers |
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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 (4.5 V TO 6.3 V) INTERNAL TIME-BASE COUNTER FOR REALTIME PROCESSING INTERNAL BINARY COUNTER REGISTER WITH SERIAL 1/0 CAPABILITY SOFTWARE/HARDWARE COMPATIBLE WITH OTHER ~ MEMBERS OF WD4000 FAMILY .,.t:I E GENERAL DESCRfPTfON ~ III In a system, the WD4020 performs exactly like the WD4200; this important benefit facili- tates development and debug of a WD4200 program prior to masking the final part. FIGURE 2 WD4020 BLOCK DIAGRAM 487 Pin No. 1 2 3,5,6,7,8, 9,10.36 4 11,12,13,14, 18,19,20,21 15,16,26,27 17 22 23 24 25 28,29,30,31 32 33 34,35 37,38,39,40 Symbol CKO CKI IPo - IP7 --RESET Lo - L7 INa - IN3 VCC GND SI SO SK Go - G3 SKIP -AD/DATA PB - p, Do - D3 DESCRIPTION
System oscillalor out...
