HT82K68A

Preliminary Features · · · · · · · Multimedia Keyboard Encoder Body · · · · · · · HT82K68A Operating voltage: 2.2V~5.5V 34(42-pin)/32(40-pin) bidirectional I/O lines One 8-bit programmable timer counter with overflow interrupts Crystal or RC oscillator Watchdog Timer 3K´16 program ROM 160´8 data RAM HALT function and wake-up feature reduce power consumption Six-level subroutine nesting Bit manipulation instructions 16-bit table read instructions 63 powerful instructions All instructions in 1 or 2 machine cycles 40-pin DIP/42-pin DIP/DICE form package General Description The HT82K68A is an 8-bit high performance peripheral interface IC, designed for multiple I/O products and multimedia applications. It supports interface to a low speed PC with multimedia keyboard or wireless keyboard in Windows 95, Windows 98 or Windows 2000 environment. A HALT feature is included to reduce power consumption. 1 April 20, 2000 Preliminary Block Diagram S T A C K 0 S T A C K 1 S T A C K 2 S T A C K 3 P ro g ra m R O M P ro g ra m C o u n te r S T A C K 4 S T A C K 5 In te rru p t C ir c u it S Y S C L K /4 T M R T M R C HT82K68A IN T C 8 b it S Y S C L K /4 W D T M U X R C O S C In s tr u c tio n R e g is te r M P 0 M P 1 M U X D A T A M e m o ry W D T S W D T P r e s c a le r In s tr u c tio n D e c o d e r A L U T im in g G e n e ra to r M U X P E C P E S T A T U S P D C P D P C C P C P O R T E P E 0 ~ P E 4 P O R T D P D 0 ~ P D 7 S h ifte r P O R T C P C 0 ~ P C 7 ...