CDM 800
IC403
VDD
VSS
C0
Voltage booster
C1
for LCD driver
V1
V2
V3
RESET
System Controller
TEST
Standby Controller
Timing Generator
XIN
High freq.
XOUT
Low freq.
A/D Converter
VAREF
P22
VASS
to
P20
IC801
2
XT
3
XT
4
RST
IC951
REC.
SW
VS
VO
8
7
9
GRUNDIG Service
Common outputs
COM3 to COM0
L C D
PSW
Flags RBS
ALU
Time Base
timer
Clock Generator
Watchdog
Timer
8-bit
P07
(AIN7)
P07
to
to
to
P00
(AIN0)
P00
GND
VDD
1
20
Oscillation
circuit
Timing
4bit micro controller
generator
ROM :768x8 bits
RAM : 16x4 bits
Input port (with built-in pull-down resistor)
5
6
7
K2
K0
K1
OSCILLATOR
DET
GND
OSC
VCC
3
6
5
4
Platinenabbildungen und Schaltpläne / Layout of PCBs and Circuit Diagrams
Segment outputs
SEG11 to SEG0
driver
Stack Pointer
Data Memory
Register banks
Interrupt Controller
16-bit
8-bit
Timer/
Timer/
Counter
Counter
TC1
TC3 TC5
P17
P35
to
to
P10
P30
TXOVT TXON
19
18
Large current
output ports
Output port
8
9
10
9
K5
K3
K4
K6
IC4
1CH
2
1
FB
NC
OUT1
-IN1
2
1
P67
P77
P87
P93
to
to
to
to
P60
P70
P80
P90
Program
Counter
(RAM)
Program
Memory (ROM)
8-bit
Inst Register
Serial
Interface
Inst Decoder
SIO1 SIO2
P47
to
P40
CODE
17
16
T3
15
T2
14
T1
13
T0
10
K7
+
+
2CH
-
-
3
4
5
6
+IN1
V
+IN2
-IN2
OUT2
EE
7
8
VCC
3 - 15