Kenwood TK-940 service manual Microprocessor 75308BGK740BE9 LCD Assy IC2

SEMICONDUCTOR DATA

Microprocessor : 75308BGK740BE9 (LCD Assy IC2)

Terminal connection diagram

	o m m t - w m * m m - o m m t - w m				~ m ~ -
	w m m m m m m m m m m * * * * * * * * *
P61	61				40	PO2
	62				39	PO1
P62
	63				38	PO0
P63
	64				37	P53
P70
	65				36	P52
P71
	66				35	P51
P72
	67				34	P50
P73
	68				33	Vss
RESET
	69				32	P43
S0
	70				3 1	P42
S1
	7 1				30	P41
S2
	72				29	P40
S3
	73				28	VLCP
S 4
	74				27	V L C ~
S5
	75				26	VLCO
S6
	76				25	BIAS
S7
	77				24	COM3
S8
					23	COM2
S9
					22	COM I
S10
	80				21	COMO
S l I
		-	N m *	m w t - ~ ~ O
	- N m ~ m w t - m m z -
			- - - - - -		m

Terminal function

Pin No.	Pin Name
1-20	S12-S31
21 -24 COMO-COM3
25	BIAS
26-28 VLCO-VLCZ
29-32 P40-P43
33	Vss

34-37 P50-P53

--

38PO0

39-41 PO1-PO3

42P I 0

43P I 1

4 5 4 5 P12, P I 3

46P20

47P21

4 8 P22

49P23

50P30 - '

51P31

I10Function

0 LCD output (S20-SII.

0LCD COMO-COM3 output

0LCD power supply voltage. - LCD voltage level generator.

-Open (not use).

-GND.

-Open (not use).

IHOOK (PC) ser~aldata input.

-Open (not use).

ISer~aldata input.

I PTT (PC) serial data input.

-Open (not use).

0Beep output (HI).

0~ e i output (Med).

0Beep output (Lo).

-Open (not use).

0PTT (PC) serial data output.

0HOOK (PC) serial data output.

Pin No.	Pin Name	I10	Function
52	P32	-	Open (not use).

53/ P33--0 Serial data output.

54	I	VDD	-		+5V.
55	1	XT1	-		+5V.
56		XT2	-	1	Open (not use).
57		NC	-		Open (not use).
58, 59		XI, X2	-	1	System clock input.
60		P60	I	I	AUX swltch input.
61		P61	1 I		SCAN swltch ~npui .
62	-P62		-I		Volume up switch input.
63		P63	I		Volurne down switch input.	,
64		P70	I		Group up swltch input.
65		P71	I		Group down switch input.
66		P72	I		System up switch input.
-1'467-		P73	I		System down swl 'h input.
: '68		RESET	I		System reset ~nput.
69-80		1	0		LCD output (532-S21).