Yamaha FB-01 Service Manual page 22

/iPD71051C USART (Universal—Synchronous Asynchronous Receiver—Transmitter) XA996001
NO. NAME
-■ U 0
FUNCTION
RxD
GND
D4
D5
D6
D7
TxC
WR
CS
12 C/D I
13 RD I
14
j
Data bus
Serial data in
Ground
Data bus (A0 ~A3)
Transmitter clock
Write Control
Chip select
Control/Data
"H": Control/Status "L'
Read Control
Receiver ready
: Data
PIN
NO.
NAME
I/O
D1 I/O
DO I/O
Vcc
RxC
1
DTR
RTS
El
FUNCTION
TEMP
y Data bus
DC Voltage (+5V)
Receiver clock
Data terminal ready
Request to Send
Data set ready
Reset
Clock
Serial data out
Transmitter empty
Clear to Send
SYNC Detect/Break Detect
Transmitter ready
YM2164 OPP Operator (iT216400)