Matsushita Electric KX-TC1461LAB, Service Manual

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Pin Port Name Label Init. I/O Description Remark
1 XOUT
XOUT
O 4MHz crystal oscillator
2 XIN
XIN
I 4MHz crystal oscillator
3 TEST
TEST
I Must be connected to Vss
4 P67
RSSIN
I Carrier detect input (combo chip
sigout) H: carrier present
5 P66
PAGE
H I PAGE KEY L: KEY PRESSED
6 P65
DTMF5
H O recradle control, DTMF out5
7 P64
DTMF4
H O DTMF out4
8 P63
DTMF3
H O DTMF out3
9 P62
DTMF2
H O DTMF out2
10 P61
DTMF1
H O DTMF out1
11 P60
DTMF0
H O DTMF out0
12 P77
LEDP1
H O In-Use LED low: on
13 P76
LEDP2
H O
14 VSS
GND
Ground
15 P75
TXDATA
L O TX path data output
16 P74
TXRFPWR
H O TX RF POWER CONTROL L: RF POWER
17 P73
TXPWR
H O TX power control L: TX power
18 P72
RESERVED
H O
19 P17
FLASHOPT
L I Flash time option H: 600ms, L
20 P16
COMCLK
L O Combo chip clock, normal low
output Pull low through
10k
21 P15
COMDATA
L O Combo chip data, normal low output
22 P14
COMSTB
L O Combo chip strobe, normal low
output
23 P13
RXDATA
H I RX path data input
24 P12
LSEIZE
L O Line seize control H: seize line
25 P11
CHGDET
H I charge detect L: charge
26 P10
RINGDET
H I ring detect
27 RESET
RESET
I Power on reset pulse signal (w/
charge reset)
28 VDD
VDD
Power supply (+5V)
16.2. Digital Security Coding System
Every time the handset is put on the charging cradle of base unit, a 16-bit digital security code
is generated and exchanged between base and handset. The security code is randomly selected
amongst 65536 combinations. This is to comply with FCC Part 15.214(d) requirement.
17. CPU DATA (Handset)
17.1. U1 (273010114312)
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