参数资料
型号: M37270EFSP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 8.1 MHz, MICROCONTROLLER, PDIP64
封装: 0.750 INCH, 1.78 MM PITCH, SHRINK, PLASTIC, DIP-64
文件页数: 29/94页
文件大小: 1551K
代理商: M37270EFSP
MITSUBISHI MICROCOMPUTERS
M37270MF-XXXSP
M37270EF-XXXSP, M37270EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
35
Fig. 34. Sync pulse counter register
Sync pulse counter register
(SYC : address 00EA16)
Count value
Count source
Count time
0: HSYNC
signal
1: Composite
sync signal
f(XIN)/213
(1024
s, f(XIN) = 8 MHz)
70
(12) Synchronizing Signal Counter
The synchronizing signal counter counts the composite sync signal
taken out from a video signal in the data slicer circuit or the vertical
synchronizing signal Vsep as a count source.
The count value in a certain time (T time) generated by f(XIN)/213 or
f(XIN)/213 is stored into the 5-bit latch. Accordingly, the latch value
changes in the cycle of T time. When the count value exceeds “1F16,”
“1F16” is stored into the latch.
The latch value can be obtained by reading out the sync pulse counter
register (address 00EA16). A count source is selected by bit 5 of the
sync pulse counter register.
The synchronizing signal counter is used when bit 0 of the PWM
mode register 1 (address 02EA16).
Figure 34 shows the structure of the sync pulse counter and Figure
35 shows the synchronizing signal counter block diagram.
Fig. 35. Synchronizing signal counter block diagram
Reset
5-bit counter
Latch (5 bits)
f(XIN)/213
Composite
sync signal
HSYNC signal
Counter
Sync pulse
counter register
Data bus
Selection gate : connected to black
colored side when
reset.
b5
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