Epson PhotoPC 800, Руководство по обслуживанию

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EPSON PhotoPC 800 Revision A
Operating Principle Operating principles of the Circuit Boards 44
Table 2-7. 8-bit Microprocessor Port Specification Table 2-8. 8-bit Microprocessor Port Specification
Pin Signal Name I/O Outline
1 CHG VOL I Strobe charge voltage input (analog input)
2,3 NOT USED -- Connect to GND
4-7 SCAN IN 0-3 I Key matrix input
8 AVDD -- Analog power input terminal
9 AVREF I Analog standard voltage input terminal
10 /STBY (R) LED O Standby LED (red) drive L:LED light
11 /STBY (G) LED O Standby LED (green) drive L:LED light
12 VSS -- GND87
13 /SELF LED O Self-timer LED drive L:LED light
14 VF LED O Viewfinder LED drive L:LED light
15-19 NOT USED -- Connect to GND
20 /AVREF ON O
Analog standard voltage ON/OFF signal
L:ON
21 BUZZER O Buzzer output
22 CHG ON O Strobe charge ON/OFF signal H:ON
23-25 COM1- COM3 O Mode LCD common output
26 NOT USED O --
27 BIAS --
Mode LCD drive power supply (connect to
VLCO)
28-30 VLC0 - VLC2 --
Mode LCD power input terminal (external
register connection)
31 VSS -- GND
32-49 S1-S18 O LCD segment output 1-19
50-55 NOT USED O --
56 NOT USED O Connect to GND
Pin Signal Name I/O Outline
57-59 SCAN IN4-6 I Keymatrix input
64 WAKE UP O SPARC Wake up terminal
65-69 NOT USED O Connect to GND
70 PA ON O DC/DC converter (analog) ON/OFF signal H:ON
71 P ON O DC/DC converter (digital) O/OFF signal H:ON
72 /DIN CONNECT I PC cable connection detection H:Connection
73 CARD I Memory card detection L:Attachment
74 V JACK I Video cable connection detection H:Connection
75 SI I Serial data input (
⇐
ASIC)
76 SO O Serial data output (
⇒
ASIC)
77 SCK O Serial clock output (
⇒
ASIC)
78 IC --
Internal connection (Connect to VSS terminal
directly)
79 XOUT O Main clock oscillation terminal
80 XIN I Main clock oscillation terminal (4MHz)
81 VDD -- VDD
82 XCIN I Clock oscillation terminal (32. 768 kHz)
83 XOUT O Clock oscillation terminal
84 /RESET I Reset input
85 /BAT OFF I Battery OFF detection signal
86 RXD I Host wake up input terminal L:ON
87 /SREQ I
Serial communication request signal
L:Serial request
88 USB I USB cable connection detection L:Connection
89,90 NOT USED -- Connect to GND