M306V5ME-XXXSP Datasheet, PDF (160/263 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M306V5ME-XXXSP
M306V5EESP
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
2.14.5 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 syn-
chronous signal and vertical synchronizing signal. The circuit operates by setting bit 0 of data slicer
control register 1 (address 026016) to “1.”
The reference clock can be used as a display clock for OSD function in addition to the data slicer. The
HSYNC signal can be used as a count source instead of the composite sync signal. However, when the
HSYNC signal is selected, the data slicer cannot be used. A count source of the reference clock can be
selected by bit 2 of data slicer control register 1 (address 026016).
For the pins HLF, connect a resistor and a capacitor as shown in Figure 2.14.1 Make the length of wiring
which is connected to these pins as short as possible so that a leakage current may not be generated.
Note: It takes a few tens of milliseconds until the reference clock becomes stable after the data slicer and
the timing signal generating circuit are started. In this period, various timing signals, Hsep signals
and Vsep signals become unstable. For this reason, take stabilization time into consideration
when programming.
Composite
sync signal
Bit 5 of DSC2
0
1
1
AB
Figure 2.14.7 Determination of v-pulse waveform
Rev. 1.0
159