M306V5EESP Mitsubishi, M306V5EESP Datasheet - Page 180

• Manufacturer Part Number: M306V5EESP
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER
• Manufacturer: Mitsubishi

180
Figure 2.16.17 I/O polarity control register
2.16.5 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 synchronizing signal waveform of interlacing system. The dot line 0 or 1 (refer to
Figure 2.16.18) 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 negative-polarity inputs will be explained. A field determination is determined
by detecting the time from a falling edge of the horizontal sync signal until a falling edge of the V
control signal (refer to Figure 2.16.9) 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 regarded as odd field.
The field determination flag changes at a rising edge of V
The contents of this field can be read out by the field determination flag (bit 7 of the I/O polarity control
register at address 0206
Figure 2.16.18).
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 6.
I/O polarity control register
b7 b6 b5 b4 b3 b2 b1 b0
0
16
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
). A dot line is specified by bit 6 of the I/O polarity control register (refer to
Note: Refer to Figure 2.16.19.
Bit symbol
Symbol
PC0
PC1
PC2
Reserved bit
PC4
PC5
PC6
PC7
PC
H
polarity switch bit
R, G, B output
polarity switch bit
OUT1 output
polarity switch bit
OUT2 output
polarity switch bit
Display dot line
selection bit
(See note)
Field determination
flag
V
polarity switch bit
SYNC
SYNC
Bit name
input
input
Address
0206
16
SYNC
0 : Positive polarity input
1 : Negative polarity input
0 : Positive polarity input
1 : Negative polarity input
0 : Positive polarity output
1 : Negative polarity output
Must always be set to “0.”
0 : Positive polarity output
1 : Negative polarity output
0 : Positive polarity output
1 : Negative polarity output
0 : “
1 : “
0 : Even field
1 : Odd field
“
“
When reset
1000X000
” at even field
” at even field
” at odd field
” at odd field
control signal in the microcomputer .
and ON-SCREEN DISPLAY CONTROLLER
Function
2
MITSUBISHI MICROCOMPUTERS
M306V5ME-XXXSP
M306V5EESP
R W
SYNC
Rev. 1.0