Sony SPP-M920 Primary, Service Manual

Page: 27 / 49

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