Commodore Plus 4 Service Manual page 12

M1 SCHEMATIC ON PAGE 11
PIN
CONFIGURATION
VSS
CS0
CS1
RES
RXC
- 1 28 -R/W
XTL 1
XTL0
RTS
CTS
TXO
OTR
RXO
RS0
RS1
-
-
-
-
-
-
-
-
-
-
-
-
-
2 27
3 26
4 25
5 24
6
23
7
6551
22
8
21
9 20
10 19
11 18
12 17
13 16
14
15
U3-901895-02
ACIA
-02
-IRQ
-07
-06
-05
-04
-03
-02
-01
-00
-OSR
-OCO
-VCC
I
SYNERTEK ISYP6551A 12 MHZ
FE
17
16
15
14
13
12
11
10
F7
F6
F5
F4
GNO
PIN
CONFIGURATION
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1 28
2 27
3 26
4 25
5
24
6 23
7 22
8 21
9 20
10 19
11 18
12 17
13 16
14 15
U19-251641-02
PLA
-VCC
-18
-19
-110
-111
-112
-113
-114
-1115
-CE
-F0
-F1
-F2
-F3
TRANSMIT/RECIEVE CHARACTERISTICS
CHARACTERTISTICS SYM
-02
2 MHZ
UNIT
MIN MAX
*
TRANSMIT /RECEIVE
tCCY
400
CLOCK RATE
- ns
TRANSMIT /RECEIVE
tCH
175
CLOCK HIGH TIME
-
ns
TRANSM IT/RECEIVE
tCL
175
CLOCK LOW TIME
- ns
XTL1 TO TXD
tDD
500
PROPAGATION DELAY
- ns
RTS PROPAGATION
tDLY
500
DELAY
- ns
IRO PROPAGATION
tIRO 500
DELA Y (CLEAR)
-
ns
(tr, tf
=
10 to 30 ns)
*The Baud Rate with External Clocking is:
BAUD RATE 1
16 x TCCY
CS R/W 00-07
-
L L DATA BUS
1-
TO PORT
-
L H
PORT TO
-
DATA BUS
-
-
H X ISOLATION
-
-
L
=
LOW LEVEL
H HIGH LEVEL
X
=
IRREVELANT
R/W
P0
P1
P2
P3
P4
P5
P6
P7
VSS
-
-
MOS 6529B
U5/U27-251640-03
SINGLE PORT
INTERFACE
PIN
CONFIGURATION
1 20
-VOD
2 19 -CS
3 18
-OB0
4 17
-OB1
5
6529
16
6 15
-DB2
-OB3
7 14 -OB4
8 13 -085
9 12 -OB6
10 11
-OB7
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Plus 4 Schematic #310164 (2 of 4)
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