
1-5
FUNCTIONAL
BLOCK
DIAGRAM
(Package
:
80P6S-A)
Fig. 3 Functional block diagram
FUNCTIONAL BLOCK
HARDWARE
FUNCTIONAL BLOCK
3874 Group User’s Manual
Key-on
wake-up
T
OUT
INT
0
ADT
Reset
Data
bus
C
P
U
A
X
Y
S
PC
H
PC
L
PS
RESET
V
CC
V
SS
Reset
input
(5
V
)
(0
V
)
R
O
M
R
A
M
25
71
30
I/O
port
P5
P4(8)
I/O
port
P4
I/O
port
P2
P2(8)
I/O
port
P0
P0(8)
I/O
port
P1
P1(8)
I/O
port
P3
P3(8)
I/O
port
P6
P5(8)
I/O
port
P9
P9(1)
47
48
49
50
51
52
53
54
39
40
41
42
43
44
45
46
31
32
33
34
35
36
37
38
55
56
57
58
59
60
61
62
18
19
20
21
22
23
26
24
17
10
11
12
13
14
15
16
P6(8)
27
Clock
generating
circuit
X
IN
OUT
X
Main-clock
input
Main-clock
output
COUT
X
CIN
Sub-clock
output
Sub-clock
input
Serial
I/O1(8)
Timer
X(16)
Timer
Y(16)
Timer
1(8)
Timer
2(8)
Timer
3(8)
φ
28
29
74
75
76
77
78
79
80
1
I/O
port
P7
P7(8)
2
345
67
9
8
I/O
port
P8
P8(8)
63
64
65
66
67
68
69
70
72
73
V
REF
AV
SS
X
CIN
COUT
X
INT
2
,INT
1
INT
5
,INT
4,
INT
3
RTP
1
,RTP
0
CNTR
1
,CNTR
0
A-D
converter
(8)
BUS
IN
,BUS
OUT
Serial
I/O3
automatic
transfer
controller
Serial
I/O3
automatic
transfer
RAM
Local
data
bus
Watchdog
timer
Reset
D-A
converter
(8)
Serial
I/O2(8)
Data
link
layer
communication
control
circuit