Flag P (1)
Carry
Carry
4
4
4
4
Register V(4)
Register W(2)
Timer 1(9)
1F(1)
2F(1)
Register R(8)
Timer2(8)
EXF
(1)
INTE
(1)
Port F(4)
Port G(4)
Port K(1)
Port S(8)
Port D(12)
Multiplexer
Register E(8)
Register D(3)
8
4
4
4
Register H(4)
Register L(4)
SIOF (1)
Serial I/O circuit
Register J(4)
Register A(4)
Register B(4)
Clock
generating
circuit
Stack register SDP(8)
CY(1)
Carry
RAM
128 words X 4 bits
Address
Data
Data pointer DP
Z(1)
X(2)
Y(4)
Stack register SK (11)
Stack register SK (11)
Stack register SK (11)
Stack register SK (11)
3
2
1
0
ROM
2044 words X 9 bits
Address
Data
Program counter PC
PC (4)
H
PC (7)
L
Control circuit
Control signal
7
4
8
9
9
11
4
4
2
7
4
4
8
12
4
4
10
3
2
1 42
38 39 40 41
15 14 13 12
25 24 23 22 19 18 17 16
37 36 35 34 33 32 31 30 29 28 27 26
11
21
20
9
6
7
8
5
4
V
V
CNV
C
CE
RESET
V
X
X
DD
IN
OUT
P
SS
SS
Reset
input
Wake
up input
Connection
of an external
capacitor
Clock
input
Clock
output
Pull-down
Power supply input
INT
S
OUT
CLK
S
IN
S / K
RDY
O
I/O port F
Interrupt input
I/O port G
Serial I/O port/
Input port K
I/O port S
I/O port D ~D
4
11
Output port D ~D
0
3
(Accumulator)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
P5
P0
P0
P0
P0
P0
P0
P0
P0
P4
P4
P4
P4
P3
P3
P3
P3
RESET
P5
P5
V
2
7
6
5
4
3
2
1
0
3
2
3
2
1
0
1
0
/CNTR
/CNTR
/INT
/INT
1
0
1
0
1
0
CC
/X
/X
COUT
IN
P5
P1
P1
P1
P1
P1
P1
P1
P1
P2
P2
P2
P2
P2
P2
P2
P2
V
X
X
V
3
7
6
5
4
3
2
1
0
7
6
3
2
1
4
5
0
/IN
/IN
/IN
/IN
1
0
IN
OUT
S
CLK
S
S
T
T
/IN
/IN
/IN
/IN
3
2
7
6
4
5
RDY
OUT
IN
1
0
SS
RGF
M37471M2-XXXSP
M37471M4-XXXSP
M37471M8-XXXSP
M 100-CF
3 - 16
Schaltpläne und Platinenabbildungen / Circuit Diagrams and Layout of PCBs
GRUNDIG Service
Clock generating
circuit
RAM
128
bytes
ROM
4096
bytes
Program
counter
PC (8)
Program
counter
PC (8)
H
L
(Note 2)
(Note 1)
Data bus
8-bit
Arithmatic
and
logical
unit
Accumulator
A(8)
Processor
status
register
PS(8)
Index
register
X(8)
Index
register
Y(8)
Stack
pointer
S(8)
Timer 1 (8)
Timer 2 (8)
Timer 3 (8)
Timer 4 (8)
Instruction
register (8)
Control signal
X
X
CIN
COUT
X
X
IN
OUT
Clock
input
Clock
output
RESET
Reset input
V
CC
V
CC
X
X
CIN
COUT
INT
INT
0
1
CNTR
1
CNTR
0
P5(4)
P4(4)
P3(8)
P2(8)
P1(8)
A-D converter
Byte
counter(4)
SI/O(8)
P0(8)
Input port P5
I/O port P4
Input port P3
I/O port P2
I/O port P1
I/O port P0
V
Reference
vollage input
REF
24 23
42
1
33 32 31 30
29 28 27 26
18
10 11 12 13 14 15 16 17
2 3 4 5 6 7 8 9
41 40 39 38 37 36 35 34
19
20
25
22
21
Instruction
decoder
PWM control
M 37471
IC 404 M 37471 (8-BIT CMOS MICROCOMPUTER)
IC 501 M 34240 (4-BIT CMOS MICROCOMPUTER)
