Midland Syn-Tech 70-342XL Service Manual page 67

MICROPROCESSOR (IC901) PINOUTS
n c
RESET
GND
OSC 1
o s c 2
HLT
TEST
vcc
ROO
R01
R02
R03
R10
R 1 1
R12
R 1 3
INTO
INTl
R20
R21
R22
R23
R30
R 3 1
R32
R33
DO
D 1
D2
- - - - - -
.
PIN
NO.
----
1
2
3
4
5
6
7
8
9
1 0
11
1 2
13
INPUT/
OUTPUT
----------
PIN
N A M E
------
D 3
D4
D 5
D6
D7
D 8
D9
D l 0
D l 1
Dl2
D l 3
Dl4
Dl5
OUT
OUT
OUT
I N
BOTH
BOTH
OUT
I N
I N
OUT
OUT
I N
OUT
OUT
OUT
OUT
OUT
I N
I N
I N
I N
I N
I N
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
I N
OUT
-
- - - - - - -
SIGNAL
N A M E
C
- - - --
- -
-
DSTB+
TXTM-
ALM-
SQSIG+
TSQMON-
PLCL-
VCOCNTL
SCAN-
PRI-
DSPSTL-
DSPSTH-
ALBH-
TXDL
DSPO+
DSPl+
DSP2+
DSP3+
UP-
DWN-
INH+
TA-
PTT+
RMAO+
RMAl+
RMA2+
RMA3+
RMA4+
RMA5+
ASTB+
AUXSTB+
PSST+
CHDT+
DCLK
- - -- - - -
-
-
FUNCTION
-.-------------------------------------------------------
S t r o b e f o r s e r i a l d a t a t o s y n t h e s i z e r
TX/RX mode c o n t r o l t o o p t i o n (TX Mode
=
LO)
A l e r t t o n e ( 2 KHz)
Noise s q u e l c h s t a t u s (HI
=
carrier p r e s e n t )
LO i n
=
Sq Tone decoded o r MONITOR push b u t t o n i s i n
Scan a c t i v i t y ( s c a n s t o p p e d
=
LO o u t )
S y n t h e s i z e r PLL s t a t u s (LO i n = PLL u n l o c k e d )
RX Mute and T X i n h i b d u r i n g c h a n n e l change,etc.=LO o u t
V C O band s w i t c h c o n t r o l (Upper c h a n n e l s s e l e c t e d
=
LO)
SCAN push b u t t o n s t a t u s (LO
=
p u s h b u t t o n i s i n )
PRI push b u t t o n s t a t u s (LO
=
push b u t t o n i s i n )
S t r o b e f o r ONE'S d i g i t o f CHANNEL d i s p l a y d a t a
S t r o b e f o r TEN'S d i g i t of CHANNEL d i s p l a y d a t a
A-band/B-band jumper s t a t u s
TX/RX Mode c o n t r o l (TX
=
LO)
CPU Reset (HI
=
R e s e t )
Clock o s c i l l a t o r ( 8 0 0 KHz +/-5%)
Clock o s c i l l a t o r ( 8 0 0
KHz
+/-5%)
Standby Mode (HI
=
S l e e p )
n o t used
Vcc ( 5 V o l t s , +/-lo%)
LED D i s p l a y d a t a ( 8 V o l t l o g i c l e v e l s )
LED D i s p l a y d a t a (8 V o l t l o g i c l e v e l s )
LED D i s p l a y d a t a ( 8 V o l t l o g i c l e v e l s )
LED D i s p l a y d a t a ( 8 V o l t l o g i c l e v e l s )
CHANNEL UP p u s h b u t t o n s t a t u s (LO
=
p r e s s e d )
CHANNEL DOWN p u s h b u t t o n s t a t u s (LO
=
p r e s s e d )
PTT i n h i b i t s t a t u s (HI
=
D e a c t i v a t e PTT)
Talk-Around select(HI=TX/RX f r e q same; LO=TX/RX o f f s e t )
PTT (Push-To-Talk) s t a t u s (HI
=
PTT a c t i v a t e d )
n o t used
E/PROM a d d r e s s i n g
E/PROM a d d r e s s i n g
E/PROM a d d r e s s i n g
E/PROM a d d r e s s i n g
E/PROM a d d r e s s i n g
E/PROM low-order a d d r e s s i n g ; o r E/PROM Enable
S t r o b e f o r E/PROM a d d r e s s l a t c h
S t r o b e f o r AUXILIARY d a t a t o o p t i o n
S t r o b e f o r E/PROM d a t a o u t . i n t o s h i f t r e g i s t e r IC902
S e r i a l d a t a from s h i f t r e g i . s t e r IC902
Clock f o r CHDT+
H I
=
3.5 t o 5 V o l t s DC; LO
=
0 t o 1 . 5 V o l t s D C