Yamaha CLAVINOVA CVP-105 Service Manual page 17

MSM82C51A-2GS-K (XV513A00)
USART (Universal Synchronous Asynchronous receiver Transmitter)
PIN
NAME I/O
NO.
1 D2 I/O
2 D3 I/O
3 RXD I
4 NC
5 GND
6 D4 I/O
7 D5 I/O
8 D6 I/O
9 D7 I/O
10 /TXC I
11 /WR I
12 /CS I
13 NC
14 C//D I
15 /RD I
16 RXRDY O
PCM1716E (XU829A00) DAC (Digital to Analog Converter)
PIN
NAME
I/O
NO.
1 LRCK I
2 DATA I
3 BCK I
4 CLKO O
5 XTI I
6 XTO O
7 DGND -
8 VDD -
9 Vcc2R -
10 AGND2R -
11 EXTR O
12 NC -
13 VOUTR O
14 AGND1 -
FUNCTION
Data Bus
Data Bus
Serial Data
Ground
Data Bus
Data Bus
Data Bus
Data Bus
Clock
Write signal
Device select
Access select signal
Read signal
character data
FUNCTION
Data input
Bit clock
Clock input
Clock input
Clock out
Digital ground
Digital power supply (+5 V)
Analog power supply (+5 V)
Analog ground
Rch, analog output
Rch, analog voltage output
Analog ground
PIN
NAME I/O
NO.
17 TXRDY O
18 SYNDET/BD I/O
19 /CTS I
20 NC
21 TXEMPTY O
22 TXD O
23 CLK I
24 RESET I
25 /DSR I
26 /RTS O
27 /DTR O
28 /RXC I
29 NC
30 VCC I
31 D0 I/O
32 D1 I/O
PIN
NAME I/O
NO.
15 Vcc1 -
16 VOUTL O
17 NC -
18 EXTL O
19 AGND2L -
20 Vcc2L -
21 /ZERO O
22 /RST I
23 /CS/IWO I
24 MODE I
25 /MUTE I
26 MD/DM0 I
27 MC/DM1 I
28 ML/IIS I
CVP-105
DM : IC400
FUNCTION
character data
character data
input terminal for modem interface
character data
character data
Clock
Reset
input port for modem interface
output port for modem interface
output port for modem interface
Clock
Power supply
Data Bus
Data Bus
DM : IC800
FUNCTION
Analog power supply (+5 V)
Lch, analog voltage output
Lch, analog output
Analog ground
Analog power supply (+5 V)
Zero data flag
Reset
Chip select
Mode control select
(H: Software, L: Hardware)
Mute control
Mode control data/De-emphasis select1
Mode control BCK/De-emphasis select2
Mode control Latch/input format select
17