NAD T744 - Page 47

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 5Port 4
P5 P4
(2)(2)
Flash
64Kx8
EEPROM
2Kx8
T i m e r 0
I N T
RA M
256 x 8
T
0
T
1
R
x
D
T
x
D
W R
RD
E A
PSE N
A
LE/
XT
A L 2
XT A L 1
E UAR T
C P U
T i m e r 1
I
N
T
1
C t r l
I
N
T
0
(2)
(2)
C51
C O R E
(2) (2) (2) (2)
P o r t 0
P
0
P o r t 1
P o r t 2 P o r t 3
P a r a ll e l I/ O P o r t s & E x t . B u s
P
1
P
2
P
3
X RA M
1K x 8
IB-bus
P CA
R
ESET
P R OG
W a t c h
D og
P
CA
E
C
I
V
ss
V
CC
(2)(2)
(1)(1)
T i m e r 2
T
2
E
X
T
2
(1) (1)
F l as h
32 K x 8 o r
16 K x 8
K ey
B o a r d
R O M
2 K x 8
B oo t
+
BR G
SPI
M
ISO
M
OSI
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
VCC
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
75W6dB
75W6dB
6dB
75W