Yamaha ME-100FS Service Manual page 17

pPD8251 (iG118500) AFC USART (universal-synchronous Asynchous Receiver-Transmitter)
LHOO8OB (iG137000) CPU
FUNCTION
-
Data bus
1
DC Voltage
(
+
5V)
Rececver clock
Data terminal ready
Request to Send
Data set ready
Reset
Clock
Serial data out
Transmitter empty
'Clear to Send
SYNC detect I Break Detect
Transmitter ready
LSI DATA TABLE
29
NAME
DO
Vcc
RxC
-
DTR
-
RTS
-
DSR
RST
CLK
TxD
TEMP
;(T+S
SYND
TxRDY
L t
28
27
26
25
2 4
23
22
21
20
19
18
17
16
15
' I N
NO.
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
1 7
18
1 9
2 0
110
'I0
I10
I
0
0
I
I
I
0
0
I
110
0
1 ;
2
3
4
5
6
7
8
9
10
11
l2
13
1 4
110
'I0
I10
I
I10
110
I10
I10
I
I
I
I
I
0
NAME
D2
D3
RxD
GND
D 4
0 5
D6
D7
-
WR
-
CS
-
RD
RxRDY
' I N
NO.
40
3 9
3 8
3 7
3 6
3 5
3 4
3 3
3 2
3 1
3 0
2 9
2 8
27
2 6
2 5
2 4
2 3
2 2
2 1
NAME
AD11
AD12
AD13
AD14
AD15
e
0 4
0 3
D 5
D 6
+ 5
D 2
D7
DO
D l
INT
NMI
HALT
MREQ
lQRQ
FUNCTION
}-Data bus
Serial data In
Ground
I
Data bus (A0
-
A31
Transmitter clock
W r ~ t e Control
Chip select
ControllData
"H":
ControllStatus "L". Data
Read Controll
Receiver ready
110
0
0
0
0
0
0
0
0
0
0
0
0
0
I
I
I
0
0
0
NAME
AD10
AD9
AD8
AD7
AD6
AD5
AD4
AD3
AD2
AD1
ADO
GND
RFSH
-
M I
RESET
WAlT
WR
-
RD
FUNCTION
\
Address bus
,
DC Supply (OVI
Refresh
Machine Cycle one
Reset
Bus Request
Wait
Bus Acknowledge
Write control
Read control
110
0
0
0
0
0
I
110
110
110
I10
I10
I10
110
110
I
I
0
0
0
FUNCTION
Address bus
Clock
1
Data bus
DC Supply
( +
5V)
1
Data bus
Interrupt Request
Non ,Maskable Interrupt
Halt State
Memory Request
Input I Output Request