Casio CTK-611 User Manual download pdf (Page 8)

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CPU (LSI1: UPD913GF-3BA)

The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a key controller and serial interfaces.

The CPU detects key velocity by counting the time between first-key input signal FI and second-key SI from

the keyboard. The CPU reads sound data and velocity data from the sound source ROM in accordance with

the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then the

CPU provides 16-bit serial sound data to the DSP. The CPU also controls MIDI input/output and stores

sequencer data into the working storage RAM.

The following table shows the pin functions of LSI1.

Pin No. Terminal In/Out Function

1 TXD0 Out MIDI signal output

2 RXD0 In MIDI signal input

3 SCK0 Out APO (Auto Power Off) signal output

4, 5 TXD1, RXD2 In/Out Data bus for the LCD driver

6 SCK1 Out 1 MHZ synchronizing pulse output

7 AVCC In DVDD (+5 V) source

8 AN0 In

AC adaptor detection terminal.

+5 V when the keyboard is powered by batteries and becomes

V to cancel the APO function when AC adaptor is connected.

9 AN1 — Not used. Connected to ground.

10 AGND In Ground (0 V) source

11 BCK Out Bit clock output

12 SO Out Serial sound data output

13 LRCK Out Word clock output

14 GND In Ground (0 V) source

15, 16 XLT0, XLT1 In/Out 20 MHz clock input/output

17 VCC In +5 V source

18, 19 MD0, MD1 In Mode selection terminal

20 RSTB In Reset signal input

21 NMI In Power ON signal input

22 INT/P10 In/Out Data bus for the LCD driver

23 ~ 30

FI0 ~ FI3

In Terminal for key input signal

SI0 ~ SI3

31 ~ 38 KC0 ~ KC7 Out Terminal for key scan signal

39 ~ 46

FI4 ~ FI7

In Terminal for key input signal

SI4 ~ SI7

47 ~ 50

FI8, FI9

— Not used

SI8, SI9

51 FI10 In Terminal for button input signal

52 SI10/P23 Out Chip enable signal for the LCD driver

53 ~ 55 KI0 ~ KI2 In Terminal for button input signal

56 MWNB Out Write enable signal for the DSP

57 ~ 76 MA0 ~ MA17 Out Address bus

77 MCSB0 Out Chip enable signal output for the sound source ROM

78 MCSB1 Out Not used

79 MCSB2 Out Chip enable signal output for the DSP

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 24 25

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Casio CTK-611 User Manual Page 8

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