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Holtek HT640/S Data Sheet
Page 2
P
PIIN
N D
DE
ES
SC
CR
RIIP
PT
TIIO
ON
NS
S
Pin Name
I/O
Internal
Connection
Description
A0-A11
I
TRANSMISSION
GATE
Input pins for address A0-A9 setting
They can be externally set to VDD, VSS, or left open.
D0-D7
I
TRANSMISSION
GATE
Input pins for data (D0-D7) setting
They can be externally set to VDD, VSS, or left open.
DOUT
O
CMOS OUT
Encoder data serial transmission output
TE
I
CMOS In
Pull-low
Transmission enable, active high
OSC1
I
OSCILLATOR
Oscillator input pin
OSC2
O
OSCILLATOR
Oscillator output pin
VSS
I
Negative power supply (GND)
VDD
I
Positive power supply
A
AP
PP
PR
RO
OX
XIIM
MA
AT
TE
E IIN
NT
TE
ER
RN
NA
AL
L C
CIIR
RC
CU
UIIT
TS
S
TRANSMISSION
GATE
CMOS OUT
CMOS IN
Pull Low
OSCILLATOR
OSC1
OSC2
EN
P
PIIN
N O
OU
UT
T
VDD
D0
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
D1
D2
D3
D4
D5
D6
D7
TE
DOUT
OSC2
OSC1
VSS
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13