M306V2 Mitsubishi, M306V2 Datasheet - Page 171

• Manufacturer Part Number: M306V2
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

Rev. 1.0
Figure 2.14.8 Signals in vertical blanking interval
2.14.6 Data Slice Line Specification Circuit
Composite video
signal
(1) Specification of data slice line
(2) Specification of line to set slice voltage
(3) Field determination
Video signal
This circuit decides a line on which caption data is superimposed. The line 21 (fixed), 1 appropriate
line for a period of 1 field (total 2 line for a period of 1 field), and both fields (F1 and F2) are sliced their
data. The caption position register (address 0266
The counter is reset at the falling edge of V
counter value matched the value specified by bits 4 to 0 of the caption position register, this H
sliced.
The values of “00
line). Figure 2.14.8 shows the signals in the vertical blanking interval. Figure 2.14.9 shows the caption
position register.
The reference voltage for slicing (slice voltage) is generated for the clock run-in pulse in the particular
line (refer to Table 2.14.1). The field to generate slice voltage is specified by bit 1 of data slicer control
register 1. The line to generate slice voltage 1 field is specified by bits 6, 7 of the caption position
register (refer to Table 2.14.1).
The field determination flag can be read out by bit 3 of data slicer control register 2. This flag change
at the falling edge of V
V
H
sep
sep
16
Composite video
signal
H
” to “1F
Window for
deteminating
clock-run-in
sep
sep
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
.
16
Count value to be set in the caption position register (“0F
” can be set in the caption position register (at setting only 1 appropriate
Vertical blanking interval
Clock run-in
sep
and is incremented by 1 every Hsep pulse. When the
16
) is used for each setting (refer to Table 2.14.1).
Start bit
Start bit + 16-bit data
and ON-SCREEN DISPLAY CONTROLLER
1 appropriate line is set by
the caption position register
(when setting line 19)
16
MITSUBISHI MICROCOMPUTERS
” in this case)
M306V2ME-XXXFP
M306V2EEFP
Line 21
Magnified drawing
sep
is
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