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CPU (LSI1: MSM6755B-10)
Containing a sound data ROM and a DAC (Digital to Analog Convertor), the CPU provides sound waveform in accordance with the pressed key and the selected tone. The CPU also records the voice picked up the microphone, using the built-in ADC (Analog to Digital Convertor) and the RAM. The following table shows the pin functions of LSI1.
Pin No. 1 2 3 4 ~ 19 13 17 20 ~ 27 28, 29 30 31 32, 33 34 35 36 37 38 39 40 41 42, 43 44 45 46 47 48 49 50 51 52 53 54 55, 56 57 58 ~ 65 66 ~ 73 74 ~ 78 79 80 ~ 95 96 97 ~ 100 Terminal MA14 MWEB NC0 MA0 ~ MA13 MRDB MCSB MD0 ~ MD7 NC1, NC2 DGND DVCC XTL0, XTL1 NC3 RSTB RXD TXD NMI APO NC4 REFH NC5, NC6 DAOR NC7 AVdac DAOL REFL AGdac AGadc ANI AVadc NC8 MOD0 MOD1, MOD2 P40 KI0 ~ KI7 KO1 ~ KO8 � LVCC � LGND � In/Out Out Out � Out Out Out In/Out � In In In/Out � In � � In Out � Out � Out � In � Out � In In In � In In In In Out � In � In � Function Address bus Write enable signal output Not used. Address bus Read enable signal output Chip select signal for the RAM Data bus Not used. Ground source +5 V source 20 MHz clock input/output Not used. Reset signal input Not used. Connected to +5 V. Not used. Power ON signal input APO(Auto Power Off) signal output Not used. Terminal for the built-in DAC/ADC Not used. Sound waveform output Not used. +5 V source for the built-in DAC/ADC Not used. Terminal for the built-in DAC/ADC Not used. Ground source for the built-in ADC Analog signal input +5 V source for the built-in ADC Not used. Mode selection terminal Mode selection terminal APO cancellation signal input Terminals for key/button input signal Terminals for key scan signal Not used. +5 V source Not used. Ground source Not used.
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