YMF781 Datasheet, PDF (3/14 Pages) YAMAHA CORPORATION – APL-1 Automobile sound PLayer-1

YMF781
■Terminal Functions
No. Terminal Name (Port) I/O (Output Type)
Functions
1 A14
O
(4mA)
External memory Address bus 14
2 A15
O
3 A16
O
4 LBN/LWRN (P36) O
5 UBN/UWRN (P37) O
(4mA)
(4mA)
(4mA)
(4mA)
External memory
External memory
External memory
External memory
Address bus 15
Address bus 16
Low byte enable
Upper byte enable
6 VSS
-
Ground
7 VDD
-
Power Supply (3.3V)
8 LED1
O
(4mA)
LED output 1
9 LED2
O
(4mA)
LED output 2
10 RTSN
(P00) O
(4mA)
Asynchronous Serial (UART) transmission request output
11 CTSN
(P01) Ish
Asynchronous Serial (UART) transmission request input
12 TXD
13 RXD
14 VDD
15 VSS
(P10) O
(P11) Ish
-
-
(4mA)
Asynchronous Serial (UART) transmission output
Asynchronous Serial (UART) reception input
Power supply (3.3V)
Ground
16 VDDC
-
Power supply (3.3V/5.0V)
17 PD
Ish
Power-down
18 HSEL
(P20) Ish
Serial interface selection (Asynchronous / clock sync)
19 SMODE
(P21) Ish
Clock sync serial mode selection (MSB/LSB first)
20 SWRN
(P22) Ish
Clock sync serial write enable
21 SRDYN
(P23) Ish/O (4mA)
Clock sync serial ready
22 SCLKN
23 SDO
24 SDI
25 IRQN
(P24)
(P25)
(P26)
Ish
Ish/O
Ish
O
(4mA)
(4mA)
Clock sync serial
Clock sync serial
Clock sync serial
Interrupt output
clock
data output
data input
26 SEL
Ish
Port selection (clock sync serial / port2)
27 VSS
-
Ground
28 XI
I
X’tal connection
29 XO
30 VDD
31 VSS
O
X’tal connection
-
Power supply (3.3V)
-
Ground
32 VDD
-
Power supply (3.3V)
33 TST0
Ish
Test input terminal Normally, connect to the ground and use.
34 TST1
Ish
Test input terminal Normally, connect to the ground and use.
35 TDO
O
Test output terminal Normally, use without connection.
36 TMS
Ish
Test input terminal Normally, connect to the power supply
(VDD) and use.
37 TCK
Ish
Test input terminal Normally, connect to the power supply
(VDD) and use.
38 TDI
Ish
Test input terminal Normally, connect to the power supply
(VDD) and use.
39 TRSTN
Ish
Test input terminal normally, connect to the Ground and use.
40 RSTN
Ish
Hardware reset
41 VDD
42 VSS
43 VREF
44 AOL
-
Power supply (3.3V)
-
Ground
A-
Analog Reference Signal
AO
Analog Lch output or Lch+Rch output (monaural)
45 AOR
AO
Analog Rch output
46 EQ1
A-
Equalizer terminal 1
47 EQ2
A-
Equalizer terminal 2
48 EQ3
A-
Equalizer terminal 3
49 SPVDD
-
Power supply for exclusive use of speaker (3.3V)
50 SPVSS
-
Ground for exclusive use of speaker
Note1: Ｏ: CMOS output terminal, I: CMOS input terminal, Ish: Schmitt CMOS input terminal, A: Analog terminal
Note2: The current value of the ( ) in the I/O (output type) indicates the output drive capability of its terminal.
Note3: The power supply, VDDC can be switched to 3.3V or 5.0V.
Note4: For the terminals without the description of “VDDC is used” in the table, VDD (only 3.3V) is used to drive it.
VDDC is used
VDDC is used
VDDC is used
VDDC is used
VDDC is used
VDDC is used
VDDC is used
VDDC is used
VDDC is used
VDDC is used
VDDC is used
VDDC is used
VDDC is used
VDDC is used
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