Figure 3 Block Diagram - AUTOHELM Masterview ST80 Manual

D7
P4
D4
+12V
P1 REGULATOR
+12V
D5
V1
IC14
P2
0V
P5
D6
0V
SeaTalk
P3
DATA
SeaTalk
P6
DATA
RESET
W'DOG
BUZZER
R-C
TIMING
VHELD
VUNREG
IC4
ASIC
VCC
TR18 ROM 5V
TR17
B1
3V
LITHIUM
RAM 5V
TR11
TR13
RES
TR10
TR19
3
4
2 5
1 6
CONNECTOR LOCATION
VIEWED FROM BACK OF
INSTRUMENT (OUTSIDE)

Figure 3 Block Diagram

Signal flow is left to right except where indicated.
16 Masterview Service Manual 83028_1
VEL TO EL PANEL
DRIVERS
PA.2
VUNREG
VHELD TO ASIC IC4
VCC (+5V)
PA.4
0V
0V EL TO EL PANEL
DRIVERS
P8.2
DATA Rx
P9.2
PA.6
DATA Tx
P9.0
ST_EN
P6.2
RESET
P8.1
WATCHDOG
P9.4
BUZZCONTROL
P6.1
P8.5
BZ1 BUZZER
PA.0
POWER FAIL
P8.0
RESET
XL1
XTAL
16MHz
A0
to
A18
P9.5
P8.4
PA.3
RD
RD
HWR
OE
HWR P8.3
WE
P8.4
P8.4
CE
A0 - A18
Vcc
IC2
PA.5
FLASH
DATA
MEMORY
D8
D0 - D7
to
RD
OE
D15
HWR
WE
P8.3
CE
P4.0
A0 - A16
to
P4.7
Vcc
CE2
PA.7
IC15
RAM
RES
B_LEVEL
P7.3
B_SENSE
P6.8
SW1
PC.0
SW2
PC.1
SW3
PC.6
PC.2
SW4
PC.7
IC13
MICROPROCESSOR
VEL
EL TR23
TR20
TR7
L6
TR23
+
TR7
C37
0VEL
VUNREG
TR3
CONTRAST
TR12
C8 IC16
NEGATIVE VOLTAGE
CURRENT AMP &
GENERATOR
INTEGRATOR
VUNREG
LED2 LED1
TR5
TR6
LED4 LED3
LED6 LED5
LED8 LED7
D_RES
D/L
CS3A
CS3A
CLK1
CLK2
VEE
D_RES D_RES
R/W
CS3B CS3B
CLK1
CLK2
VEE
D_RES
CS3C CS3C
CLK1
CLK2
VEE
L0-7
D_RES
CS3D CS3D
CLK1
CLK2
VEE
SCAN
VEE
ST80 Masterview
PL7
T3
TO ELECTRO-
EL1
LUMINESCENT
N/C
EL2
PANEL
PL8
R22
VEE
V2
V5
R17
d
+
R18
V4
c
+
R19
V3
b
+
R20
V6
a
+
IC10
R21
R27
V1
VCC
LCD CONTRAST V1 - V6
V1-4
V1-4
RST
D/L
D/L
R/W
R/W
CS3
COL1
L0-7
DB0-7
to
CLK1
COL64
CLK2
M
M
FRM
FRM
CL2
CL2
IC5
LCD DRIVER
V1-4
V1-4
RST
D/L
D/L
R/W
R/W
CS3
COL65
L0-7
DB0-7
to
CLK1
COL128
CLK2
M
M
FRM
FRM
CL2
CL2
IC6
LCD DRIVER
V1-4
V1-4
RST
D/L
D/L
R/W
R/W
CS3
L0-7
COL129
DB0-7
to
CLK1
COL192
CLK2
M
M
FRM
FRM
CL2
CL2
IC7
LCD DRIVER
V1-4
V1-4
RST
D/L
D/L
R/W
R/W
COL193
CS3
L0-7
to
DB0-7
COL256
CLK1
CLK2
M
M
FRM
FRM
CL2
CL2
IC8
LCD DRIVER
CLK1
CLK2
M
FRM
V1
V1 CL2
V2
V2
ROW1
V5
V5
to
V6
V6
ROW64
LCD
IC9
DISPLAY
LCD DRIVER
D2603-1