Changhong Electric 21NF55, Руководство по обслуживанию, Страница: 24 / 83

SERVICE MANUAL
22
4) pinning
Table 5
SYMBOL PIN DESCRIPTION
P1.3/T1 1 port 1.3 or Counter/Timer 1 input
P1.6/SCL 2 port 1.6 or I
2
C-bus clock line
P1.7/SDA 3 port 1.7 or I
2
C-bus data line
P2.0/TPWM 4 port 2.0 or Tuning PWM output
P3.0/ADCO/PWMO 5 port 3.0 or ADC0 input or PWM0 output
P3.1/ADC1/PWM1 6 port 3.1 or ADC1 input or PWM1 output
P3.2/ADC1/PWM2 7 port 3.2 or ADC2 input or PWM2 output
P3.3/ADC3/PWM3 8 port 3.3 or ADC3 input or PWM3 output
VSSC/P 9 digital ground for
μ
-Controller core and periphery
P0.5 10 port 0.5 (8mA current sinking capability for direct drive of LEDs)
P0.6 11 port 0.6 (8mA current sinking capability for direct drive of LEDs)
VSSA 12 analog ground of Teletext decoder and digital ground of TV-processor
SECPLL 13 SECAM PLL decoupling
VP2 14 2nd supply voltage TV-processor (+8V)
DECDIG 15 decoupling digital supply of TV-processor
PH2LF 16 phase-2 filter
PH1LF 17 phase-1 filter
GND3 18 ground 3 for TV-processor
DECBG 19 bandgap decoupling
AVL/EWD
(1)
20 Automatic Volume Levelling/East-West drive output
VDRB 21 vertical drive B output
VDRA 22 vertical drive A output
IFIN1 23 IF input 1
IFIN2 24 IF input 2
IREF 25 reference current input
VSC 26 vertical sawtooth capacitor
TUNERAGC 27 tuner AGC output
AUDEEM/SIFIN1
(1)
28 audio deemphasis or SIF input 1
DECSDEM/SIFIN2
(1)
29 decoupling sound demodulator or SIF input2
GND2 30 ground 2 for TV processor
SNDPLL/SIFAGC
(1)
31 narrow band PLL filter/AGC sound IF
AVL/SNDIF/REFO/
AMOUT
(1)
32
Automatic Volume Levelling/sound IF input/subcarrier reference
output/AM output
HOUT 33 (non controlled)
FBISO 34 horizontal output
AUDEXT/
QSSO/AMOUT
(1)
35
flyback input/sand castle output
EHTO
36
external audio input/QSS intercarrier out/AM audio output (non
controlled)
PLLIF 37 EHT/overvoltage protection input
IFVO/SVO 38 IF-PLL loop filter
VP1 39 IF video output/selected CVBS output
CVBSINT 40 main supply voltage TV-processor (+8V)
GND1 41 internal CVBS input
CVBS/Y 42 ground 1 for TV-processor
CHROMA 43 external CVBS/Y input
AUDOUT/AMOUT
(1)
44 chrominance input (SVHS)
INSSW2 45 2nd RGB/YUV insertion input
R2/VIN 46 2nd R input/V (R-Y) input
G2/YIN 47 2nd G input/U input