Daewoo DSD-9251MA, Service Manual

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12
CIRCUIT OPERATING MANUAL
This section only provides summaries of individual function of each Port.
Further discussion will be followed in individual port section.
¥ I
2
C_DATA (PIO1_0)
¥ I
2
C_CLK (PIO1_2)
Used for the transmission of Serial and control of Tuner, CI-Max, AV Switch and RF Modulator.
ClkPolarity ClkPhase
0 1
Serial clock SCIK
Plns MTSR/MRST
First
bit
Last
bit
Shift data
Latch data
Transmit data
Feature 7. I
2
C Timing
Chart 3. PIO Map
PIO NAME I/O Function Remarks
PIO1_0 I2C_Data(SSC0) I/O
PIO1_2 I2C_Clk O
PIO1_3 NOTPGM_EN O L:Flash program enable
PIO1_4 SLOW_S/W I
H:VCR Scart Input ON
L: VCR Scart Input OFF
PIO1_5 RS232_Tx O
PIO1_6 RS232_Rx I
PIO2_7 KI1 I
PIO3_0 COM0 O
PIO3_1 COM1 O
PIO3_2 COM2 O
PIO3_3 COM3 O
PIO3_4 COM4 O
PIO3_5 Seg_clk/K7 O
PIO3_6 TriggerIN I
PIO3_7 TriggerOUT O
PIO4_0 SegA/K0 O
PIO4_1 SegB/K1 O
PIO4_2 SegC/K2 O
PIO4_3 SegD/K3 O
PIO4_4 SegE/K4 O
PIO4_5 SegF/K5 O
PIO4_6 REMOCON_IN I
PIO4_7 SegG/K6 O