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