Diagrams - NAD L 70 Service Manual

u-COM IC PIN ASSIGNMENT & BLOCK DIAGRAM
PIN ASSIGNMENTS
(TOP VIEW)
(CIN5/KEY6) P46
(CIN4/KEY7) P47
BLOCK DIAGRAM
VDD
Power Supply
VSS
VFT Power
VKK
Supply
Reset I/O RESET
TEST
Test Pin
XIN
Resonator
XOUT
connecting
Pins
64 63
(SIS) P97 65
VKK
66
(KEY0) P40
67
(KEY1) P41
68
(KEY2) P42
69
(KEY3) P43
70
(KEY4) P44
71
(KEY5) P45
72
73
74
(CIN3) P50
75
(CIN2) P51
76
(CIN1) P52
77
(CIN0) P53 78
P54 79
(PWM/PDO) P55 80
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
I/O Ports Output Ports
P97 P87
to to
P90 P80
P9 P8
P S W
Flags
ALU
System Controller
Standby Controller
Time Base
Timing Generator
High
frequ.
Clock
Generator
Low Watchdog
frequ.
P2
P22 P07
to
P20 P00
62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41
I/O Ports
P77
to
P70
P7
VFT drive circuit (automatic display)
Stack Pointer
RBS
Interrupt Controller
16-bit
Timer Timer/Counters
TC1 TC2
Timer
P0 P1
P17
to to
P10
I/O Ports
2-13
40 P66 (G9)
P65 (G10)
39
P64 (G11)
38
P63 (G12)
37
P62 (G13)
36
P61 (G14)
35
P60 (G15)
34
VDD
33
32 P07
31 P06
P05
30
P04
29
P03
28
27 P02
26 P01
25 P00
P67
to
P60
P6
Program counter
Data Memory
(RAM)
Program Memory
Register banks
(ROM)
8-bit Serial
Timer/Counters Interfaces
TC3 TC4 SIO HSO
6-bit A/D
Converter
P3 P5
P37 P55
to to
P30 P50
Key scan
control
Inst.
Register
Inst.
Decoder
P4
P47
to
P40