Diagrams; Ic Pin Function; Icf-Sw77 - Sony ICF-SW77 Service Manual

ICF-SW77
SECTION 4
DIAGRAMS
4-1. 1C PIN FUNCTION
IC801 (MAIN MICRO COMPUTER)
M50933
Pin No.
Port Name
I/O
Signal Name
Description
1
S8
0 SEG8
SEGMENT SIGNAL OUTPUT TO LCD801
2
S7
0
SEG7
SEGMENT SIGNAL OUTPUT TO LCD801
3
S6
0
SEG6
SEGMENT SIGNAL OUTPUT TO LCD801
4
S5
0
SEG5
SEGMENT SIGNAL OUTPUT TO LCD801
5 S4
0
SEG4
SEGMENT SIGNAL OUTPUT TO LCD801
6
S3
0
SEG3
SEGMENT SIGNAL OUTPUT TO LCD801
7
S2
0
SEG2
SEGMENT SIGNAL OUTPUT TO LCD801
8
SI
0
SEGl
SEGMENT SIGNAL OUTPUT TO LCD801
9
SO
0
SEGO
SEGMENT SIGNAL OUTPUT TO LCD801
10
COM3 0
COM3
COMMON SIGNAL OUTPUT TO LCD801
11
COM2 0
COM2
COMMON SIGNAL OUTPUT TO LCD801
12
COM1 0
COM1
COMMON SIGNAL OUTPUT TO LCD801
13
COMO
0
COMO
COMMON SIGNAL OUTPUT TO LCD801
14
VL1
I
BIAS VOLTAGE FOR LCD801
15
VL2 I
BIAS VOLTAGE FOR LCD801
16
VL3 I
BIAS VOLTAGE FOR LCD801
17
vcc
-
POWER SUPPLY INPUT
18
CNTR
I
PULSE CONUNTER FOR ROTARY ENCODER INPUT
19
SRDY
I
SERIAL COMMUNICATION READY SIGNAL INPUT
20
SCK
0
SERIAL COMMUNICATION CLOCK OUTPUT
21
SO 0
SERIAL COMMUNICATION DATA OUTPUT
22
SI I
SERIAL COMMUNICATION DATA INPUT
23
SSTART
0
SERIAL START SIGNAL OUTPUT. COMMUNICATED WITH IC802
24
SREQ I
SERIAL COMMUNICATION REQUEST FROM IC802
25 XCI
I
CONNECTED TO CRYSTAL OSCILLATOR (X801)
26 XCO
0
CONNECTED TO CRYSTAL OSCILLATOR (X801)
27
IntT
I
PULSE COUNTER FOR ROTARY ENCODER INPUT
28
vss
I
CONNECTED TO GROUND
29
RESET I
RESET SIGNAL INPUT
30
XI
I
CONNECTED TO CRYSTAL OSCILLATOR (X802)
31
XO
0
CONNECTED TO CRYSTAL OSCILLATOR (X802)
32
VSS
-
CONNECTED TO GROUND
33
P27 I
(P27)
KEY INPUT REQUEST FOR KR7 AND KR8
34
P26
I
KR6
KEY RETURN SIGNAL INPUT
35
P25
I
KR5
KEY RETURN SIGNAL INPUT
36 P24
I
KR4
KEY RETURN SIGNAL INPUT
37
P23 I
KR3
KEY RETURN SIGNAL INPUT
38 P22
I
KR2
KEY RETURN SIGNAL INPUT
39 P21
I
krT
KEY RETURN SIGNAL INPUT
40 P20 I
KRO
KEY RETURN SIGNAL INPUT
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