DAC (LSI104: 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 LSI1.
Pin No. TerminalIn/OutFunction
1SELIn Mode selection terminal. Connected to ground.
2D.GNDIn Ground (0V) source for the internal digital circuit
3NC Not used.
4DVDDIn +5V source for the internal digital circuit
5A.GNDIn Ground (0V) source for the right channel
6R.OUTOut Right channel sound waveform output
7, 8A.VDDIn +5V source for the internal analog circuit
9R.REFIn Right channel reference voltage terminal
10L.REFIn Left channel reference voltage terminal
11L.OUTOut Left channel sound waveform output
12A.GNDIn Ground (0V) source for the left channel
13LRCKIn Word clock input
14LRSELIn Not used. Connected to ground.
15SIIn Sound data input
16CLKIn Bit clock input
KEY CONTROLLER (LSI107: 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
LSI107
RDKeyboard
HG52E35P
APO
CRDB
WR
CWRBKC0
KC
Key scan signal
CKI~
CLOCK
CCSBKC7
A13
A14First contact
RESETRESB
FI0
SI0
CD0FI
Data bus
Key input signal
CD7
SI
FI7
Second contact
SI7
Address busCA0 ~ CA2
N 14 N |
ACEC
CASIO
