— 42 —
Pin No.
51
52
53
54
55 to 61
62
63
64
65 to 68
69 to 72
73
74
75
76
77
78
79
80
81 to 88
89
90 to 92
93
94
95
96
97
98
99
100
I/O
O
I
I
I
—
—
—
—
—
O
O
I
I
I
O
O
O
O
I/O
I
I
I
I
I
—
I
—
—
O
Description
Echo mute input (H: Echo mute) (K750) (Not used:K550)
KARAOKE mode select switch (H: KARAOKE, L: NORMAL (K750) (Not used:K550)
K550 model select (H: K550) (Not used:K750)
K750 model select (H: K750) (Not used:K550)
(Not used)
Power supply (+5V)
(Not used)
Ground
(Not used)
Address bus output
Check LED control
Test mode 1. Normally "H"
Test mode 2. Normally "H"
Test mode 3. Normally "H"
Device system reset
STANDBY LED lighting signal output (H: lighting)
FL tube driver, chip enable
FL tube turning off output
Data bus input/output
A/D port for MIC control input (K750) (Not used:K550)
A/D port for key input
NTSC/PAL output mode setting terminal
A/D port music volume input (K750), ATT select (K550)
A/D port music volume input (K750) (Not used:K550)
Ground
A/D port for echo volume input (K750) (Not used:K550)
Power supply (+5V)
Power supply (+5V)
DNR chip select
Pin Name
ECHO MUTE
KARAOKE
MODEL1
MODEL2
A15 to A9
Vcc
A8
Vss
A7 to A4
A3 to A0
TESTLED
TEST1
TEST2
TEST3
XRST OUT
PWONLED
FLCS
XBLK
D7 to D0
MICCONT
KEY0 to KEY2
N/P SW
MUSICVOL
VOCALVOL
AVss
ECHOVOL
VREF
AVcc
DNRCS
