Newsgroups: alt.radio.scanner
From: [email protected] (Brett Borowski)
Subject: BC200xlt CPU pinouts!
Message-ID: <[email protected]>
Originator: news@nimaster
Sender: [email protected] (USENET News System)
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Organization: Princeton University
Date: Thu, 17 Dec 1992 22:25:25 GMT
Lines: 63

Pinouts for the UC1147 CPU in the Uniden BC200xlt scanner....

Note:  ! means "not,"  If a pin does not have a designation, its destination
is given.  Ex.  "Gnd" means the pin is designated "Gnd" but "to Gnd" means
the pins was unlabeled but connected to ground.  This info comes from my
reading the schematic from the service manual--sorry for any errors!

Pin                                     Pin
1       CL1 (Keypad)                    33      !CS1
2       CL3 (Keypad)                    34      !CS2
3       CL4 (Keypad)                    35      to Gnd
4       CL5 (Keypad)                    36      to Gnd
5       CL6 (Keypad)                    37      to Gnd
6       to VCC                          38      to Gnd
7       to VCC                          39      to Gnd
8       RW1 (Keypad)                    40      to Gnd
9       RW2 (Keypad)                    41      !SKIP (to Gnd via R(10k)
10      RW3 (Keypad)                    42      to Gnd
11      RW4 (Keypad)                    43      RESET
12      to VCC                          44      !TEST
13      to Gnd                          45      OSC1
14      to Gnd                          46      OSC2
15      to Gnd via R(unknown)           47      GND
16      !HLT                            48      !BL
17      to Gnd                          49      SC
18      to Gnd via R(unknown)           50      !800
19      to Gnd via R(unknown)           51      !UHF (assumed)
20      to Gnd                          52      AIR
21      !BUSY                           53      VHI
22      !RST                            54      VLO
23      !C/D                            55      n/c
24      !CS                             56      SHIFT
25      VLC3                            57      n/c
26      VCC                             58      MUTE
27      !SCK                            59      !P/OFF
28      SI                              60      to VCC
29      SC                              61      to VCC
30      PLLEN                           62      to VCC
31      !EN1                            63      LIGHT
32      !EN2                            64      CL2 (assumed) (keypad)

R(unknown) values were not listed on the schematic or in the parts list.
(assumed) labels are based on the implications of other labels on the
schematic.

15, 18, and 19 look like they could be interesting....
And 41 should be interesting to people who don't want their scanner to
"skip" certain frequency ranges....

OSC1 and OSC2 are the feed in for the 400mhz oscillator.  This oscillator
can be replaced with a faster one to increase the scan/search speed...but
it will also decrease your light on-time...  And as far as keeping the
light on all the time...one could connect a switch to the LIGHT pin and
a VCC.  When off, it would function as normal.  When on, the light would
go on and off with the power.  Watch out for short circuits if you do
this...I fried a transistor on mine when I had a VCC to Gnd short....

Happy hacking!
Brett
--
[email protected]