RADIOMETER TCM3 - Page 71

TCM3
and
TCM30
Service
Manual
2.
TCM3
Main PCB, Continued
Input-Output
©
The
microcomputer
communicates
externally
with
the
help
of
two
NSC810
(combined
I/O,
RAM,
Timers)
QD2.and
QD3
and
one
UART
QD20.
The
Input-
output
ports
are
organised
as
follows:
Part
Function
QD2
|PAO
-
PA7
|
All
inputs
(5
front
panel
keys
+
3
unused)
QD2 |
PBO - PB7 | All
inputs
QD2 1200 Electrode type coding input
PCI Electrode type coding input
PC2 Not used
PC3 163.84 ms clock input
PC4
A/D
converter
2
(Thermistor)
input/Timer
T1
PCS Not used
QD2 |'TO input | System clock (CLK)
TO
output
|
Pulse
width
modulated
signal
for
analog
recorder
output
QD3 |PAO Watch-dog control output
PAI
Power-down.control
output
(to
heat
supply)
PA2 Audio level select output
PA3 - PA4 | Not used
PA5 Audio level sélect output
PA6 Interrupt output (RSTA)
PA7 Electrode test output (not used)
QD3 1980 163.84 ms clock input
PB1 655.36 ms clock input
PB2
Reset
output
for
parity
generator
flip-flop
PB3
Battery
low
control
input
(from
heat
supply)
PB4
Control
input
from
QASa
(AC
charger
off)
PB5
Control
input
from
supervising
thermistor
PB6 Not used
PB7 Electrode holder micro-switch input
Continued on next page
1008AR-1 9-55