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Holtek HT640/S Data Sheet
Page 5
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< 1 Word
3 Words
Transmitted Continuously
3 Words
1/2 Clock Time
Decoder
Data Out
Decoder VT
Encoder
Data Out
Encoder
Transmit
Enable
1/2 Clock Time
2 Words
2
14
Clocks
2
14
Clocks
E
EN
NC
CO
OD
DE
ER
R//D
DE
EC
CO
OD
DE
ER
R T
TIIM
MIIN
NG
G
E
EN
NC
CO
OD
DE
ER
R//D
DE
EC
CO
OD
DE
ER
R D
DA
AT
TA
A S
ST
TR
RU
UC
CT
TU
UR
RE
E
SYNC BITS
A&D BITS
PULLED TO
VCC
ADDRESS BITS
DATA BITS
A&D BITS
OPEN
A&D Bits
PULLED TO
GND
15.1mS
5.6mS
26mS
21mS
SYNC
PERIOD
SYNC BITS
A0
A1
A2
A3
A4
A5
A6
A7
A8
A9
D0
D1
D2
D3
D4
D5
D6
D7
31.02%
38.40%
8.27%
22.30%
TIME DEPENDANT ON OSCILLATOR RESISTOR CHOSEN (390k)
PERCENTAGES OF TOTAL TIME FOR ONE WORD PLUS SYNC
fosc/33
"One"
"Zero"
"Open"
Bit Pattern Interpretation
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