m37280eksp Mitsumi Electronics, Corp., m37280eksp Datasheet - Page 59

• Manufacturer Part Number: m37280eksp
• Description: Single-chip 8-bit Cmos Microcomputer With Closed Caption Decoder And On-screen Display Controller
• Manufacturer: Mitsumi Electronics, Corp.

Rev. 1.0
12.10.5 Timing Signal Generating Circuit
This circuit generates a reference clock which is 832 times as large
as the horizontal synchronous signal frequency. It also generates
various timing signals on the basis of the reference clock, horizontal
synchronous signal and vertical synchronizing signal. The circuit
operates by setting bit 0 of data slicer control register 1 (address
00E0
The reference clock can be used as a display clock for OSD function
in addition to the data slicer. The H
count source instead of the composite sync signal. However, when
the H
source of the reference clock can be selected by bit 2 of data slicer
control register 1 (address 00E0
For the pins HLF, connect a resistor and a capacitor as shown in
Figure 12.10.1. Make the length of wiring which is connected to these
pins as short as possible so that a leakage current may not be gener-
ated.
Note: It takes a few tens of milliseconds until the reference clock becomes
16
SYNC
stable after the data slicer and the timing signal generating circuit are
started. In this period, various timing signals, H
nals become unstable. For this reason, take stabilization time into con-
sideration when programming.
) to “1.”
signal is selected, the data slicer cannot be used. A count
16
).
SYNC
signal can be used as a
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
sep
signals and V
M37280MF–XXXSP, M37280MK–XXXSP
sep
sig-
Fig. 12.10.7 Determination of V-pulse Waveform
Composite
sync signal
and ON-SCREEN DISPLAY CONTROLLER
MITSUBISHI MICROCOMPUTERS
M37280EKSP
A
B
Bit 5 of DSC2
0
1
1
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