HT82K68A_01 Datasheet, PDF (1/30 Pages) Holtek Semiconductor Inc – 8-Bit Multimedia Keyboard Encoder Mask MCU

HT82K68A
8-Bit Multimedia Keyboard Encoder Mask MCU
Features
· Operating voltage: 2.4V~5.5V
· 32/34 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
· One external interrupt pin (shared with PC2)
· 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
· 20/28-pin SOP, 40-pin DIP, 48-pin SSOP package
General Description
The HT82K68A is an 8-bit high performance peripheral
interface IC, designed for multiple I/O products and mul-
timedia 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.
Block Diagram
P ro g ra m
ROM
P ro g ra m
C o u n te r
STAC K0
STAC K1
STAC K2
STAC K3
STAC K4
STAC K5
PC2
In te rru p t
C ir c u it
IN T C
In s tr u c tio n
R e g is te r
M P0
M
D ATA
M P1
U
M e m o ry
X
S Y S C L K /4
TM R
TM R C
8 b it
S Y S C L K /4
W D TS
M
W D T P r e s c a le r
W DT
U
X
In s tr u c tio n
D ecoder
T im in g
G e n e ra to r
O SC2
O SC1
RESET
VDD
VSS
M UX
A LU
S h ifte r
STATU S
ACC
PEC PO RT E
PE
PDC _{PO RT D}
PD
PCC _{PO RT C}
PC
PBC
PO RT B
PB
PAC
PO RT A
PA
RC O SC
P E 0~P E 4
P D 0~P D 7
P C 0~P C 7
P B 0~P B 7
P A 0~P A 7
Rev. 1.10
1
November 20, 2001