Onkyo TX-DS797 Service Manual page 10

MAIN MICROPROCESSOR
Terminal Descriptions
No. Function I/O Act.
8 BYTE I Input pin to change the width of external data bus. Connect to Vss.
9 CNVSS I Input pin to change the processor mode. Connect to Vss.
12 ~RESET I Reset pin of microprocessor
13 XOUT O Output pin of main clock oscillator
14 VSS I Ground pin
15 XIN I Input pin of main clock oscillator
16 VCC I Power supply pin. Apply 5V.
18 PRTCTV I H Abnormal voltage/current detection input pin from protection circuit
19 RDSSCK I CLK Modulator clock signal input pin from RDS decoder IC.
20 ~POFF I L Input pin from detection circuit of power failure
21 ~PRTCTTHM I L Input pin from thermal detector circuit.
22 SEC1H O H Output terminal to change voltage of main amplifier.
23 INT0 I H Input terminal from interrupter output of DIR IC.
24 INT1 I H Output terminal to interrupter input of DIR IC.
25 (DSPWRITE) I L Input port for check when DSP flash write.
26 DIGSO O H Serial data output pin to DSP,DIR,DAC, nd Digital input ICs.
27 DIGSI I H Serial data input pin from DSP, and DIR ICs.
28 DIGSCK O CLK Serial clock output pin to DSP,DIR,DAC,Digital input ICs.
29 ~INTRQ1 I L INTRQ input pin from DSP IC 2(CS49329)
30 ~INTRQ2 I L INTRQ input pin from DSP IC 1(CS49300)
32 ~SUBRESET O L Reset signal output pin to sub-microprocessor.
33 ~SUBPOFF O L Output pin to connect to pin POFF of sub-microprocessor.
34 ~SUBREQ I L Communication request input pin from sub-microprocessor.
35 MAINSO O H Serial data output pin to sub-microprocessor.
36 MAINSI I H Serial data input pin from sub-microprocessor.
37 MAINSCK O CLK Serial clock output pin for communication of main and sub-microprocessors.
38 ~MAINREQ O L Communication request output pin of main microprocessor.
39 ~DIRCS O L Chip select output pin of DIR IC,
40 ~DIRRST O L Reset signal output pin to DIR IC,
41 Writing port of flash memory IC.
42 ~DSPRST1 O L Reset signal output pin to DSP IC 2.
43 ~DSPCS1 O L Chip select output pin to DSP IC 1.
44 FMEM/SRAM1 O H Memory select output pin to RAM.
45 ADR151 O H Signal output pin to control address 15 of flash memory for first DSP.
46 Port to write the flash memory IC.
47 ADR161 O H Signal output pin to control address 16 of flash memory for first DSP.
48 ADR171 O H Signal output pin to control address 17 of flash memory for first DSP.
49 ~DSPRST2 O Ｌ Reset output pin to DSP IC 2.
50 ~DSPCS2 O L Chip select output pin to DSP IC 2.
51 FMEM/SRAM2 O H 2nd DSP memory select output pin.L=FLASH,H=SRAM
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Function I/O Act.
ADR152 O H Signal output pin to control address 15 of flash memory for second DSP.
ADR162 O H Signal output pin to control address 16 of flash memory for second DSP.
ADR172 O H Signal output pin to control address 17 of flash memory for second DSP.
DFSDAC O H DAC sampling control output pin.
~DARST O L Reset output pin for six channels DAC.
~CODECPD O L Reset output pin for CODEC IC.
DFSCO O H Sampling frequency control output pin for CODEC IC.
VCC I Power supply pin. Apply 5V.
VSS I Power supply pin. Connect to ground,
TRG12A O H Output pin A to control the 12V trigger circuit.
TRG12B O H Output pin B to control the 12V trigger circuit.
TRG12Z O H Output pin to control the 12V trigger circuit of zone 2.
SPRLZ2 O H Output pin to control the speaker relay of zone 2.
SLRLF O H Output pin to control the speaker relay.
POWER O H Output pin to control the relay of power source.
PLLCE O H Latch data output pin to PLL IC.
TUMUT O H Muting control output pin for tuner block.
~SD I L Signal detection input pin from tuner section.
~STEREO I L Stereo broadcast detection input pin.
RDSDATA I H Data input pin from RDS demodulator IC.
RDSSIG I H Check signal input pin of RDS demodulator IC.
AMUT O H Muting control output pin for audio circuit.
Z2LMUT O H Muting control output pin for line of zone 2.
Z2MUT O H Muting control output pin for zone 2.
VPCLK O H Serial clock output pin to electrical volume and PLL IC,
VPDATA O H Serial data output pin to electrical volume and PLL IC,
VSTB O H Strobe output pin to electrical volume IC.
TCS2 O L Chip select output pin to tone control IC of surround and center channels.
TCS1 O L Chip select output pin to tone control IC of front channel..
TDATA O H Serial data output pin to tone control IC.
TCLK O CLK Serial clock output pin to tone control IC.
FSTB O H Strobe output pin to function switch ICs.
FDATA O H Serial data output pin to function switch ICs.
FCLK O CLK Serial clock output pin to function switch ICs.
HPMUT O H Muting control output pin for headphone circuit.
VSS I Power supply pin for A/D converter. Connect to ground.
VOLH I H Measurement input pin of main amplifier output.
VREF I Reference voltage input pin for A/D converter.
VCC I Power supply pin for A/D converter. Apply 5V.
TX-DS797
Description