Datasheet Details
- Part number
- WD4020
- Manufacturer
- Western Digital
- File Size
- 349.14 KB
- Datasheet
- WD4020-WesternDigital.pdf
- Description
- ROMless N-Channel Microcontrollers
WD4020 Description
WESTERN DIGITAL c oRp o R A T / oN 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-STAT.
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.
WD4020 Applications
* 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 11,12,13,14, 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 P
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