NAD T743, Руководство по обслуживанию

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47
Timer 0
INT
RAM
256x8
T0 T1
RxD TxD
WR
RD
EA
PSEN
ALE/
XTAL2
XTAL1
EUART
CPU
Timer 1
INT1
Ctrl
INT0
(3)
(3)
C51
CORE
(3) (3) (3) (3)
Port 0
P0
Port 1 Port 2 Port 3
Parallel I/O Ports & Ext. Bus
P1 P2 P3
XRAM
1Kx8
IB-bus
PCA
RESET
PROG
Watch
Dog
PCA ECI
Vss V
CC
(3) (3)
(1)
(1)
Timer2
T2EX
T2
(1) (1)
Port 5 Port 4
P5 P4
(2) (2)
Flash
64Kx8
EEPROM
2Kx8
T imer 0
INT
RAM
256 x8
T
0
T
1
R
x
D
T
x
D
WR
RD
EA
PSEN
ALE/
XTAL2
XTAL1
EUART
CPU
T imer 1
IN
T
1
C
trl
IN
T
0
(2)
(2)
C51
CORE
(2) (2) (2) (2)
P ort 0
P
0
P ort 1 Port 2 Port 3
P arallel I/ O P orts & E xt. Bus
P
1
P
2
P
3
XRAM
1K x8
IB-bus
PCA
R
E
SET
PROG
W atch
D og
P
CA
E
C
I
V
ss
V
CC
(2) (2)
(1) (1)
T imer2
T
2
E
X
T
2
(1) (1)
F
lash
32K x8 or
16K
x8
K ey
B oard
ROM
2K x8
B oot
+
BRG
SPI
M
IS
O
M
OS
I
S
CK
(1) (1) (1)
SS
(1)
T89C51RD2
KEYBOARD: U201
74HC4051
KEYBOARD: U208
S-VIDEO BOARD: U4102, U4103
COMPOSITE VIDEO: U4201
4
6
COM OUT/IN
7
5
INH
V
EE
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
2
1
0
3
A
B
C
CHANNELS
IN/OUT
CHANNELS
IN/OUT
CHANNELS
IN/OUT
74HC4051
AT89C51RB2
KEYBOARD: U202
BA7660FS
COMPONENT VIDEO BOARD: U4301
MUTE
INA
GND
INB
GND
N.C.
INC
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
OUTA1
V
CC
OUTA2
OUTB1
OUTB2
N.C.
OUTC1
OUTC2
75W 6dB
75W 6dB
6dB 75W