Kenwood TS-830S Service Manual page 47

The frequency display resolution 1 s ldent~cal to that of the
main unit (down to 1 0 0 Hz) except for the RIT and CW
transmission frequency display Thls
I S
accompl~shed by dy-
namically driving the fluorescent dlsplay tube based on the
display and column data furnished by the
microprocessor
The power to the V F O - 2 3 0 is interlocked wlth that of the
main unit. If, however, the V F O - 2 3 0
IS
plugged Into an AC
outlet, the display, memory and output of the VFO remaln l ~ v e
even when the power switch on the main n nit 1 s OFF
Therefore, when the main unit
I S
again powered-on, the
operating state set prior to power-off will reappear Back-up
power consumption for the V F O - 2 3 0
I S
approxlmatelv 1 0 mA
Fig. 1 1 Ceramic filter (L71-0321-05) CFW470C
Item
Center frequency
6 dB bandw~dth
50 dB
bandw~dth
R~pple (wlthln
4 5 5 t 8 kHz)
Loss
Guaranteed attenuation
Input and output impedance
at 5 V
(DIGITAL UNIT, CF 1 )
R a t ~ n g
470 kHz
f
12 5 kHzor more
t
25 kHz or less
3 dB or less
4 dB or less
35
dB or less
with~n
455k 100 kHz
1.5 kf1
CH
IHIGH PROGIWMN
COUNTER
(4)
l / \ l I I
RESIDENT
ROW
lHlGW 41 I t K . 8
I
PORT 110
I
.-
'
-
.
. -
a
I
I I ' 7 '
1
DECODE
I 1 1
EXPANSION TO
fi
MORE l/O AND
MEMORY
PORT 0
I
BUS BUFFER
I
AND
LOW
PC TEMP
REG
CONTROL AND TIMING ACC BIT TEST DATA STORE
INT RESET PROG
EA
XTALI XTAL 2 ALE PSEN SS
&
V V
1 I 1 1 1 1
V
? 7
L l A
RESIDENT
IUTCRRUCT I I T I A L I Z C PROM/
CW/
OICILLATOR AODRCQ PROORAM
IINOLC
MAD w m ~ c
RAM ARRAY
CXCUOCR
-
XTAL LATCW YCMORV I T U 1TRO.C.
6 4 x 8
1 -
U P M A T E 1 T I O I C * M L C
CYCLE
RESET
E A 7
P S E N
9
10
ALE 11
PK)
VW (+5V)
PROG
24 P23
23 P22
22 P21
Terminals
P 1 0 - P I 7
P20- P27
DBo- DB,
TO. T I -
INT
-
RD
WR
ALE
PSEN
RESET
s
E A
XTAL 1. 2
lnput
and
output
port
(PORT
1)
lnput and output port (PORT 2)
Data bus
Test
Interrupt
Read
Write
Address latch enable
Program store enable
Reset
Slngle step
External access
Crystal input
Maximum rating (Ta = 2 5 " C )
Fig. 1 3 pPD8048C-155 (DIGITAL UNIT, IC11)
47
Item
Operating voltage
lnput voltage
Output voltage
Operating temperature
Storage temperature
Symbol
VCC
VDD
Vi
Vo
Topt
Tstg
Rating
-0.5- + 7 . 0 V
-0.5-
+
7.0V
-0.5- t 7 . 0 ~
- 0 . 5 - f 7 . O V
0 - + 7 0 ° C
-
6 5
-
+
1 5 0 0 ~