參數(shù)資料
型號(hào): M37373M8-XXXSP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDIP52
封裝: 0.600 INCH, 1.778 MM PITCH, SHRINK, PLASTIC, DIP-52
文件頁數(shù): 62/110頁
文件大小: 1537K
代理商: M37373M8-XXXSP
55
MITSUBISHI MICROCOMPUTERS
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37273M8-XXXSP
M37273E8SP
(4) Field Determination Display
To display the block with vertical dot size of 1/2H, whether an even
field or an odd field is determined through differences in a synchro-
nizing signal waveform of interlacing system. The dot line 0 or 1 (re-
fer to Figure 58) corresponding to the field is displayed alternately.
In the following, the field determination standard for the case where
both the horizontal sync signal and the vertical sync signal are nega-
tive-polarity inputs will be explained. A field determination is deter-
mined by detecting the time from a falling edge of the horizontal sync
signal until a falling edge of the VSYNC control signal (refer to Figure
50) in the microcomputer and then comparing this time with the time
of the previous field. When the time is longer than the comparing
time, it is regarded as even field. When the time is shorter, it is re-
garded as odd field
The contents of this field can be read out by the field determination
flag (bit 6 of the I/O polarity control register at address 00D816). A dot
line is specified by bit 5 of the I/O polarity control register (refer to
Figure 58).
However, the field determination flag read out from the CPU is fixed
to “0” at even field or “1” at odd field, regardless of bit 5.
Fig. 57. I/O Polarity Control Register
0
7
I/O polarity control register
(PC : address 00D816)
HSYNC input polarity switch bit
0 : Positive polarity input
1 : Negative polarity input
OUT2 output polarity switch bit
0 : Positive polarity output
1 : Negative polarity output
VSYNC input polarity switch bit
0 : Positive polarity input
1 : Negative polarity input
R/G/B output polarity switch bit
0 : Positive polarity output
1 : Negative polarity output
OUT1 output polarity switch bit
0 : Positive polarity output
1 : Negative polarity output
Display dot line selection bit (Note)
Field determination flag
0 : Even field
1 : Odd field
Note : Refer to Figure 58.
” at odd field
” at odd field
1 : “
” at even field
0 : “
” at even field
Fix this bit to “0.”
0
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