Renesas PCA7401 Technical Information PDF herunterladen (Seite 32)

MITSUBISHI MICROCOMPUTERS

M37270MF-XXXSP

M37270EF-XXXSP, M37270EFSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

(4) Timing Signal Generating Circuit

This circuit generates a reference clock which is 832 times as large

as the horizontal synchronizing signal frequency. It also generates

various timing signals on the basis of the reference clock, horizontal

synchronizing signal and vertical synchronizing signal. The circuit

operates by setting bit 0 of data slicer control register 2 (address

00EB

16) to “1.”

The reference clock can be used as a display clock for OSD function

in addition to the data slicer. The H

SYNC signal can be used as a

count source instead of the composite sync signal. However, when

the H

SYNC signal is selected, the data slicer cannot be used. A count

source of the reference clock can be selected by bit 1 of data slicer

control register 2 (address 00EB

16).

Fig. 23. Determination of V-pulse waveform

Composite

sync signal

V-pulse

(“L” pulse width is long,

“H” pulse width is short)

Bit 5 of

DSC2

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Renesas PCA7401 Technical Information Seite 32