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Chapter 2—Functional Description
Model 330, 340SC and 370SC Service Manual 2-69
SYSCLK
4.05MHz clock signal
IICCLK
Clock signal for the IIC data bus.
+SERCLK
Serial data transfer clock.
-SERCLK
Serial data transfer clock.
+SERDATA
Serial data transfer.
-SERDATA
Serial data transfer.
Vertical Deflection Board
I/O
Description
IICDATA
Data line for transferring the following data (I = input, O =
output), the input data are associated with an interrupt
pulse.
I
SLOAD
Input
Description
/IICINT
Interrupt used to tell the SCB that the VDB has data to
report.
Output
Description
IICCLK
Clock signal for the IIC data bus.
+SERCLK
Serial data transfer clock.
-SERCLK
Serial data transfer clock.
+SERDATA
Serial data transfer. Used to transfer the following command
data:
VH+, VH- to control the vertical amplitude (height)
VCENTRED, VCENTGRN, VCENTBLU to control
vertical
centering of the red, green and blue rasters respectively;
TRAPCORR to control keystone correction;
LRPNCORR for left and right pincushion correction;
TBPNCORR for top and bottom pincushion correction;
HLINCORR for horizontal linearity correction.
-SERDATA
Serial data transfer.
RXCORR
Horizontal correction output from DAC with 140 ohm Zout.
RYCORR
Vertical correction output from DAC with 140 ohm Zout.
GXCORR
Similar to RXCORR.
GYCORR
Similar to RYCORR.
BXCORR
Similar to RXCORR
BYCORR
Similar to RYCORR.