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Racal Instruments RA6790/GM Instruction Manual page 123

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ADDRESS BUS
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1
MODE
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-- --
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MICROCOMPUTER A6A2
SERIAL ASYNCHRONOUS INTERfACE A6AI
REMOTE
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READ
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SERIAL FR
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CPU
MEMORY
PROGRAM
WORKING
UART
I/O
INTERFACE
MEMORY
r
MEMORY
UII
,
ROMe
ISM 11
IEPROM.I
IRAMsI
WRITE
U6, US, U14
U7,Ua
U2
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INrU'
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INTERRUPT
euff
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SERIAL
U1
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REOUEST
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DATA
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'RESET A
A
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INTERRUPT
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flESET AND
LOGIC
MEMORY
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US, UB, U1&, U'8
RETENTION
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CPU DATA BUS
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VECTOR ADDRESS
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STROBE
BI,DIRECTIONAL
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RECEIVER
LATCHED
LOGIC
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TRI-STATE
ADDRESS
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SWITCH'
Ul0, U11, U'2
SWITCH U4
U11 U13
U13
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+
,
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_ -=-.t _
- - -
-- --
-- --
-- -- --
---
-,--
-- --
-- --
--
--
--~
,-
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L
.......
U45A
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DATA
BUFFERS
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U44
ARD
U21, U28,
un
U64A
DISPLA~
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-.
; .. BUFFERED DATA BUS IFPO-fP71
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....
..
....
....
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1
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DATA
,
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DATA SELECT
DATA SELECT
..
SELECT
AND
AND
...
..STRoaE
....
... STROBE
STROBl"
STROBES U47,
U2I
....
U47
U61 U35 U60
..
DATA
U6I,
~
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....
U61
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+-1'~
.-
.-
~
C.
SELECT
~
DECODER DRIVERS
DECODER DRIVERS
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I '
US1,
Ut1-U22, U3I-U40
U10,UI6,U31-34,U49
...
U61
' .
~,
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...
THRU
r4-
TUNING MODE
DATA
DATA
U64
LIQUID CRYST AL
FREOUENCY
SELECT
SELECT
....
&02
DISPLAY
LIOUID CRYSTAL
BUFFERS
BUFFERS
...-
U4
DISPLAY U3
un,
U24, U25
U7, UB, U9, U42
L_
-- -- ----
--
_ _
-.!!!Q~N~CE~R ~R~9
-- --
--
--
- +--
--1-'
,Ir
SWITCH
SWITCH
1
FRONT PANEL
PANEL 2
PANEL 1
""COlli I nnl
INDICATOR
Figure 4-16.
Front Panel Control, Block Diagram
-,
TUNING:~
KNOB
ENCODE
U58U60
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~
TA
IF/AF IA41

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