W921E840A Datasheet, PDF (5/58 Pages) Winbond – 4-BIT MICROCONTROLLER

W921E840A/W921C840
Addressing Mode
• ROM: Indirect call addressing mode
Long jump/call addressing mode
• RAM: Direct addressing mode
Indirect addressing mode
Working register addressing mode
• Look-up table addressing mode
Instruction Sets
• 117 instruction sets
Package Type
• 40-pin DIP, 48-pin QFP
The W921E840A/W921C840 microcontroller series are shown in the following table:
PART NO.
W921E840A/
W921C840
W921E841A/
W921C841
W921E842A/
W921C842
W921E843A/
W921C843
W921E844A/
W921C844
PACKAGE TYPE
40-pin DIP
40-pin DIP
40-pin DIP
40-pin DIP
48-pin QFP
FUNCTION
With pin PD.0, PD.1, BTG without dual clock XT , XT,
PC.0
With dual clock XT , XT, PC.0 without pin PD.0, PD.1,
BTG
With pin PD.0, PD.1, PC.0 without dual clock XT , XT,
BTG
With dual clock XT , XT, BTG without pin PD.0, PD.1,
PC.0
With pin PD.0, PD.1, PC.0, BTG, dual clock XT , XT
Publication Release Date: July 1999
-5-
Revision A3