Sony SPP-S2720, Руководство по обслуживанию

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38
SPP-S2720
Pin No. Pin Name I/O
Description
48 PA5 O
Not used (open)
49 WDT I Watch dog timer reset signal input terminal “H”: reset Not used (fixed at “L”)
50 RING DET I Detection signal input of the ringer coming “L”: ringer coming
51 AC POWER FAIL I Power fail detection signal input “L”: power fail
52 SS IRQ I Interrupt request signal input from the RF unit (RF271) “L” active
53 RESET I
System reset signal input from the reset signal generator (IC302) “L”: reset
For several hundreds msec. after the power supply rises, “L”: is input, then it changes to “H”
54 XT1 I Sub system clock input terminal (32.768 kHz) Not used (open)
55 XT2 O Sub system clock output terminal (32.768 kHz) Not used (open)
56 VSS1 — Ground terminal
57 CF1 I Main system clock input terminal (6 MHz)
58 CF2 O Main system clock output terminal (6 MHz)
59 VDD1 — Power supply terminal (+5V)
60
BR DET
(ON-ON/OFF)
I Line voltage detection signal input at the hook on (A/D input)
61
BR DET
(OFF-OFF)
I Line voltage detection signal input at the hook off (A/D input)
62 P82 I Not used (open)
63 SS SPI DOUT O Serial data output to the RF unit (RF271)
64 SS SPI DIN I Serial data input from the RF unit (RF271)