Handset Section - Sony SPP-M920 Service Manual

(HANDSET SECTION)

IC11 AM79C491JC-C09 (SYSTEM CONTROL)
Pin No. Pin name
1 AOP
2 AON
3 AIN
4 AV 1
SS
5 CFILT
6 IREF
7 AV 1
CC
8 TST1
9 MODE 0
10 MODE 1
11 ROW 0
12 ROW 1
13 ROW 2
14 ROW 3
15 ROW 4
16 COL 0
17 COL 1
18 COL 2
19 COL 3
20 COL 4
21 DV 1
SS
22 DV 1
CC
23 ON-CARD
24
25 ATE EN
––––––––––––––––––––––––
26 LCD RESET
––––––
27 CS
28 A0
29 DATA MON
30 NC
–––––––––––
31 PSEN
32 DV 2
CC
33 DV 2
SS
34
35
36 A14
37 ALE
38 A08
39 A09
40 A10
I/O
O Analog audio output terminal.
O Analog audio output terminal.
I Analog audio input terminal.
– Analog power supply (Ground).
O V dc bias filter terminal.
CC
O Current reference output terminal.
– Analog power supply terminal.
I Monitor discrimination terminal.
I Established basic operating mode.
I Established basic operating mode.
– Key matrix scan input terminal.
I Key matrix scan input terminal.
I Key matrix scan input terminal.
I Key matrix scan input terminal.
I Key matrix scan input terminal.
O Key matrix scan output terminal.
O Key matrix scan output terminal.
O Key matrix scan output terminal.
O Key matrix scan output terminal.
O Key matrix scan output terminal.
– Digital power supply terminal (Ground).
– Digital power supply terminal (+3V).
I Charge ON detect terminal.
– Not used (Open).
I ATE enable input.
O Reset signal output to the LCD driver (SED1235).
O Chip select output to the LCD driver (SED1235).
O Address bus output the LCD driver (SED1235).
I Data input detect terminal.
– Not used (Open).
Chip enable and output enable output to the ROM (IC4).
O
(EXTERNAL ROM VERSION ONLY)
– Digital power supply terminal (+3V).
– Digital power supply terminal (Ground).
– Not used (Open).
– Not used (Open).
– Not used (Open).
O Address latch enable output to the ROM (IC4). (EXTERNAL ROM VERSION ONLY)
I/O Address bus to the ROM (IC4). (EXTERNAL ROM VERSION ONLY)
I/O Address bus to the ROM (IC4). (EXTERNAL ROM VERSION ONLY)
I/O Address bus to the ROM (IC4). (EXTERNAL ROM VERSION ONLY)
– 27 –
Description