Sony SPP-M920 Primary, Service Manual

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Pin No. Pin name I/O Description
41 A11 I/O Address bus to the ROM (IC4). (EXTERNAL ROM VERSION ONLY)
42 A12 I/O Address bus to the ROM (IC4). (EXTERNAL ROM VERSION ONLY)
43 A13 I/O Address bus to the ROM (IC4). (EXTERNAL ROM VERSION ONLY)
44 ATE RX I ATE RX data input.
45 ATE TX O ATE TX data output.
46 AD00 I/O Serial data bus to ROM (IC3, IC4). (EXTERNAL ROM VERSION ONLY)
47 AD01 I/O Serial data bus to ROM (IC3, IC4). (EXTERNAL ROM VERSION ONLY)
48 AD02 I/O Serial data bus to ROM (IC3, IC4). (EXTERNAL ROM VERSION ONLY)
49 AD03 I/O Serial data bus to ROM (IC3, IC4).(EXTERNAL ROM VERSION ONLY)
50 AD04 I/O Serial data bus to ROM (IC3, IC4). (EXTERNAL ROM VERSION ONLY)
51 AD05 I/O Serial data bus to ROM (IC3, IC4). (EXTERNAL ROM VERSION ONLY)
52 AD06 I/O Serial data bus to ROM (IC3, IC4). (EXTERNAL ROM VERSION ONLY)
53 AD07 I/O Serial data bus to ROM (IC3, IC4). (EXTERNAL ROM VERSION ONLY)
54 DV
CC
3 – Digital power supply terminal (+3V).
55 RING O Ringer signal output.
56 DV
SS
3 – Digital power supply terminal (Ground).
57 PLL REF O 18.25MHz PLL reference frequency output.
58 WAKE UP I Activation input for intermittent reception (Stand-by cancellation input).
59 INT 0 – Not used (Open).
60 INT 1 – Not used (Open).
61 DV
SS
4 – Digital power supply terminal (Ground).
62 XTAL1 I System clock oscillator (18.25MHz).
63 XTAL2 O System data oscillator (18.25MHz).
64 DV
CC
4 – Digital power supply terminal (+3V).
65 SCLK O Serial clock output to the EEPROM (IC13) and PLL (IC2).
66 SD IN I Serial data input from EEPROM (IC13).
67 SD OUT O Serial clock output to the EEPROM (IC13) and PLL (IC2).
68 CS O Chip select output to the EEPROM (IC13).
69 PLL EN O Enable output to the PLL (IC2).
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70 RX EN O RX power ON /OFF control. L : RX ON
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71 TX EN O TX power ON /OFF control. L : TX ON
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72 LCD BL2 / PHLED O LCD back-light LED drive.
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73 BKLT / BATLED O Key back-light LED drive.
74 TX BB O TX data output terminal.
75 RX BB I RX data input terminal.
76 – Not used (Open).
77 – Not used (Open).
78 – Not used (Open).
79 – Not used (Open).
80 TST0 I Monitor discrimination terminal.
81 RESET I System reset terminal.
82 AV
CC
2 – Analog power supply terminal (+3V).
83 BATMON I Battery detect terminal.
84 AV
SS
2 – Analog power terminal (Ground).