— 10 —
Truth table of IC13
Input Output
ABCY
LLLD0
HLLD1
LHLD2
HHL D3
LLHD4
HL HD5
LHHD6
HHHD7
Output of IC16
Q3 38.4 K
Q4 19.2 K
Q5 9,600
Q6 4,800
Q7 2,400
Q8 1,200
Q9 600
Q10 300
D2
D3
RXD
GND
D4
D5
D6
D7
TXCLK
WR
CS
C/D
RD
RXRDY
D1
D0
VDD
RXCLK
DTR
RTS
DSR
RESET
CLK
TXD
TXEMP
CTS
SYNC
TXRDY
Q12
Q6
Q5
Q7
Q4
Q3
Q2
GND
VCC
Q11
Q10
Q8
Q9
RST
CLK
Q1
GND
D3
D2
D1
D0
Y
W
G
GND
VCC
D4
D5
D6
D7
A
B
C
GND
CLR
Q1
D1
D2
Q2
Q3
D3
D4
Q4
GND
VCC
Q8
D8
D7
Q7
Q6
D6
D5
Q5
CLK
GND
C32
C33
C36
VCC
GND
C34
VCC
GND
IC5
12
IC5
34
R12
1
3
2
X1
R36
C22
GND
C21
+
C38
C20
VCC
VCC
R19
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
16
15
14
13
12
11
10
9
C5
GND
R11
IC13
IC16
IC7
IC9
D2
D3
D4
D6
D1
D0
D5
D7
D2
D3
D4
D5
D6
D7
D1
D0
GND
R10
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
3-3. On line circuit (RS-232C)
1. Baud rate selection for On line (RS-232C)
Basic clock (307.2 KHz) is divided into seven clocks by binary counter IC16 and
they are supplied to D0~D6 terminals of multiplexer IC13. The IC13 outputs one
clock to USART according to the condition of select signals A, B, and C.
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