Onkyo TX-SR500/E Service Manual page 39

TERMINAL DESCRIPTION
MAIN MICROPROCESSOR
No. Terminal I/O Description
1 PROTECT I
2 VOLH I
3 BAND I
11 232TXD
12 232RXD
15 MCRDY I
16 MCSDa I
17 MCMDA O Data output terminal to the sub microprocessor.
18 MCCLK O Serial clock output terminal to the sub microprocessor
19 ~MCRST O Reset signal output terminal to the sub microprocessor
20 HPMUT O Muting control output terminal for headphone amplifier.
21 HPIN I
22 SPBRL O Speaker B relay control output terminal.
23 SEC1H O Voltage +/-B control output terminal.
24 SPACSRL O Speaker relay control output terminal for center and surround channels
25 SPAFRL O Speaker relay A control output terminal for front channels
26 POWERRL O Power source relay control output terminal
27 VCTRLA O Control signal A output terminal for the video selector switch
28 VCTRLB O Control signal B output terminal for the video selector switch
29 VMUT2 O Muting control output terminal for the video section 2
30 VMUT1 O Muting control output terminal for the video section 1
34 AMUT O Audio muting control output terminal
35 PLLSTB O Strobe signal output terminal to PLL IC
36 PLLSDO O Serial data output terminal to PLL IC
37 PLLCLK O Serial clock output terminal to PLL IC
38 TUMUT O Muting control output terminal for the tuner section
39 ~SD I
40 ~STEREO I
41 SELMUT O Muting control output terminal for selector, volume and tone IC BD3811.
42 SELCLK O Serial clock output terminal of IC BD3811.
43 SELSDO O Serial data and latch signal output terminal for IC BD3811
44 SNONE O Not used.
45 SWNONE O Not used.
46 CNONE O Not used.
47 ~DIRCS O Chip select signal output terminal to DIR IC AK4586
48 ~DSPCS O Chip select signal output terminal to DSP IC.
49 ~ROM/RAM O ROM/RAM select terminal. Not used.
50 ADDR151 O DSP boot ROM address 15 select terminal. Not used.
51 ADDR161 O DSP boot ROM address 16 select terminal.Not used.
52 ADDR171 O DSP boot ROM address 17 select terminal.Not used.
53 DSPCLK O Serial clock output terminal for DIR and DSP ICs.
54 DSPSDO O Serial data output terminal for DIR and DSP ICs.
55 ~DSPRST O Reset signal output terminal to DSP IC.
56 CDTO/SCDO I
57 INT1 I
58 INT0 I
59 ~DIRPD O Power down terminal to DIR and CODEC ICs.
60 RESET I
62 POFF I
64 ~INTREQ/~ABO I/O Interrupter input terminal from DSP IC.
66 ~RDSCLK I
69 X2
70 X1
71 TEST/VPP
72 XT2
73 XT1
76 RDSDATA I
77 RDSSIG I
Protection circuit detection input terminal
Power amplifier voltage detection terminal.
Region setting input terminal.
Not used.
Not used.
Data ready detection input terminal from the sub microprocessor.
Data input terminal from the sub microprocessor.
Input terminal to detect the connection of headphone
Broadcast detection input terminal more than a muting level.
FM stereo broadcast detection input terminal
Serial data input terminal from DIR and DSP ICs.
Input terminal to detect the status of DIR IC.
Input terminal to detect the unlock of DIR IC.
Reset input terminal
Power failure detection input terminal
RDS clock input terminal (European model only)
Connect the ceramic oscillator 12.5MHz.
Connect the ceramic oscillator 12.5MHz.
Test terminal.
Not used.
Not used.
Data input terminal of RDS broadcast (European model only)
Input terminal to check the signal of RDS broadcast (European model only)
39
TX-SR500/E