Sharp R-230HW Service Manual - Page 21

R-203HW R-220HW R-230HW DESCRIPTION OF LSI The I/O signal of the LSI are detailed in the following table. Pin No. Signal 1 RESET 2 TEST 3 VSS 4 OCS3 5 OCS4 6 VD1 7 VDD 8 9 10 11-13 AVDD AVREF AVSS P40-P42 14 P43 15 BZ 16 R00 17 R01 18 R02 19 R03 20 P20 21 P21 22 P22 23 P23 24 K00 I/O IN IN IN IN OUT IN IN IN IN IN IN IN OUT OUT OUT OUT OUT OUT OUT OUT IN IN Description Auto clear terminal. Signal is input to reset the LSI to the initial state when power is supplied. Connected to GND. Power source voltage: -5V. VSS voltage of power source circuit input. Internal clock oscillation frequency setting input. The internal clock frequency is set by inserting the resistor oscillation circuit with respect to OCS4 terminal. Internal clock oscillation frequency control output. Output to control oscillation input of OCS3. Power source for oscillation circuit. Power source voltage input terminal. Connected to GND. A/D converter power source voltage. The power source voltage to drive the A/D converter in the LSI. Connected to GND. A/D converter power source voltage. The power source voltage to drive the A/D converter in the LSI. Connected to GND. Power source voltage: -5V. AVSS voltage of power source circuit input. Connected to VSS. Terminal to change functions according to the Model. By using the A/D converter contained in the LSI, DC voltage in accordance with the Model in operation is applied to set up its function. To input signal which communicates the door open/close information to LSI. Door close "H" level signal (0V). Door open "L" level (-5V). Signal to sound buzzer (2.0 kHz). A: key touch sound. B: Completion sound. 0.1 sec. A 2.0 sec. B H : GND L : -5V H : GND L : -5V Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02 terminal while one of G1 line keys on key matrix is touched. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02 terminal while one of G2 line keys on key matrix is touched. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02 terminal while one of G3 line keys on key matrix is touched. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02 terminal while one of G4 line keys on key matrix is touched. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02 terminal while one of G5 line keys on key matrix is touched. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P23, K00, K01 and K02 terminal while one of G6 line keys on key matrix is touched. Terminal not used. Signal similar to K02. When either G7 line on key matrix is touched, a corresponding signal will be input into P23. Signal similar to K02. When either G8 line on key matrix is touched, a corresponding signal will be input into K00. 19