Sharp HT-CN300BK Service Manual - Page 42

HT-CN300 IC710 RH-iX0489AWZZ: System Microcomputer (IX0489AW) (2/2) Pin No. Port Name Terminal Name Input/Output Function 52* P42/A18 V_SEL2 Output Connected to video output selector, SW2. 53* P41/A17 V_SEL3 Output Connected to video output selector, SW4. 54* P40A16 V_SEL4 Output Connected to video output selector, SW5. 55* P37/A15 V_DATA Output Data output for electronic Vol IC control signal. 56* P36/A14 VOL_STB Output Strobe output for electronic Vol IC control signal. 57* P35/A13 VOL_CLK Output Clock output for electronic Vol IC control signal. 58* P34/A12 DOOR_SPED Output DVD/CD door speed switch output 59* P33/A11 DOOR_M+ Output Control output of CD/DVD mechanism door OPEN/CLOSE control motor. 60* P32/A10 DOOR_M- Output Control output of CD/DVD mechanism door OPEN/CLOSE control motor. 61 P31/A9 DOOR_OP Input CD/DVD mechanism door OPEN SW input. 62 VCC VCC Input Microcomputer power supply (3.3 V). 63 PP30/A8(/-/D7) DOOR_CL Input CD/DVD mechanism door CLOSE SW input. 64 VSS GND Output Connected to GND (VSS). 65 P27/A7(/D7/D6) ROM Output ROM/RAM enable control output on DSP PWB. 66 P26/A6(D6/D5) DSP_AB00T Output DSP auto boot control terminal. Auto boot starts by "L" setting at DSP RESET. 67 P25/A5(/D5/D4) OFFSET Input Detection input of 1-bit AMP ∆∑ IC's output offset voltage error. 68* P24/A4(/D4/D3) A/D_RESET Output 1-bit AMP's ∆∑ IC reset control output. 69* P23/A3(/D3/D2) DVD_+B Output Output of power control and DIG signal switch to the DVD unit. 70* P22/A2(/D2/D1) DIG_FUNC+B Output Power control output for external DIG input. 71* P21/A1(/D1/D0) BASS-SW Output Output for subwoofer amp gain control. 72 P20/A0(/D0/-) S_MUTE Output System mute control output. 73 P17/D15/INT5 A/D_REMONI Input 1-bit AMP's ∆∑ IC reset monitor output (Schmitt). 74 P16/D14/INT4 DSP_INTREQ Input DSP data reception request signal output. 75 P15/D13/INT3 H. P_SW Input Headphone SW detection input. 76* P14/D12 -B_CONT Output 1-bit AMP's +B power control relay control output. 77* P13/D11 FAN_MOTOR Output Output for cooling fan motor rotation control. 78 P12/D10 POWER Output Primary power relay control ouput. 79 P11/D9 W_SP_RLY Output Subwoofer speaker relay output. 80 P10/D8 S_SP_RLY Output Surround speaker relay output. 81 P07/D7 C_SP_RLY Output center speaker relay output. 82 P06/D6 F_SP_RLY Output Front speaker relay output 83 P05/D5 POWER_KEY Input Power operation key input. 84 P04/D4 TU_MUTE Output Tuner mute output. 85 P03/D3 CCB_DO Input Serial data input from Sanyo CCB device. 86 P02/D2 CCB_CL Output Serial clock output from Sanyo CCB device 87 P01/D1 CCB_DI Output Serial command data output from Sanyo CCB device 88 P00/D0 CCB_CE Output CE control output from Sanyo CCB device. 89 P107/AN7/K13 TUNER_SM Input A/D downloading, field strength comparison detect input. 90 P106/AN6/K12 SD_ST_IN Input A/D downloading. Tuner tuning, stereo signal detect.. 91 P105/AN5/K1 PROTECT Input A/D downloading. System error detection input. 92 P104/AN4/KI0 AREA Input A/D downloading. Destination setup for tuner band. 93 P103/AN3 TV_TYPA Input Sets the TV type by A/D downloading. 94 P102/AN2 DOOR_PROT Input Finger pinching detection input by CD/DVD mechanism door. 95 P101/KEY2 AVSS Input A/D downloading, main unit key input 2. 96 AVSS GND Input VSS terminal of A/D converter. 97 P100/ANP/ KEY1 Input A/D downloading, main unit key input 1. 98 PVREF VREF Input Reference voltage input terminal of A/D converter. 99 AVCC AVCC Input Power supply input terminal of A/D converter. 100 P97/ADTRG/SIN 4 GND Input Port processing. "L" fixed. (Not used.). In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside. - 42 -