Subject: BC200xlt CPU pinouts!
From: [email-masked] (Brett Borowski)
Date: Thu, 17 Dec 1992 22:25:25 GMT
Newsgroups: alt.radio.scanner

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-masked]