DAC (IC11: UPD6376GS)
The DAC receives 16-bit serial data output from the DSP. The data contains digital sound data of the
melody, chord, bass, and percussion for the right and left channels. The DAC converts the data into
analog waveforms by each channel and output them separately.
The following table shows the pin functions of IC11.
Pin No.TerminalIn/OutFunction
1SELInMode selection terminal. Connected to ground.
2D.GNDInGround (0 V) source for the internal digit circuit
3NCNNot used
4DVDDIn+5 V source for the internal digital circuit
5A.GNDInGround (0 V) source for the right channel
6R.OUTOutRight channel sound waveform output
7, 8A.VDDIn+5 source for the internal analog circuitV
9R.REFInRight channel reference voltage terminal
10L.REFIneft channel reference voltage terminalL
11L.OUTOutLeft channel sound waveform output
12A.GNDInGround (0 V) source for the left channel
13LRCKInWord clock input
14LRSELInNot used. Connected to ground.
15SIInSound data input
16CLKInBit clock input
KEY CONTROLLER (LSI16: HG52E35P)
The key controller generates key scan signals and provides them to the keyboard. By counting the time
between first-key input signal FI and second-key SI from the keyboard, the key controller detects key
velocity. The note number and its velocity data are read at regular intervals by the CPU.
Key Controller
LSI16
RDAB
Keyboard
HG52E35P
WRAB
CRDB
LSI17
CWRBKC0
CLKAKC
Key scan signal
CKI~?PD65611GB
HGB
CCSBKC7
First contact
RESET
RESB
FI0
SI0
CD0FI
Data bus~
Key input signal
CD7
SI
FI7
Second contactSI7
Address busCA0 ~ CA2
N 10 N |
ACEC
