參數資料
型號： M37274MA-052SP
廠商： Mitsubishi Electric Corporation
英文描述： PHOTO SM DETECTOR
中文描述： 單芯片8位CMOS微機隱蔽字幕解碼器和屏幕顯示控制器
文件頁數： 48/147頁
文件大?。?/td> 2042K
代理商： M37274MA-052SP
48
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37274EFSP
PRELIMINARY
Notice: This is not a final specification.
Some paramentic limits are subject to change.
MITSUBISHI MICROCOMPUTERS
For the main data slice line, the count value of pulses in the window
is stored in clock run-in register 1 (address 00E6
16
; refer to Figure
44). For the sub-data slice line, the count value of pulses in the window
is stored in clock run-in register (address 0209
16
; refer to Figure 45).
When this count value is 4 to 6, it is determined as a clock run-in.
Accordingly, set the count value so that the window may start after
the first pulse of the clock run-in (refer to Figure 46).
The contents to be set in the window register are written at a falling
of the horizontal synchronous signal. For this reason, even if an
instruction for setting is executed, the contents of the register cannot
be rewritten until a falling of the horizontal synchronous signal.
For the main data slice line, reference clock is counted in the period
from a falling of the clock pulse set in bits 0 to 2 of clock run-in detect
register 2 (address 00E9
16
) to the next falling. The count value is
stored in bits 3 to 7 of clock run-in detect register 1 (address 00E8
16
)
(When the count value exceeds “1F
16
,” “1F
16
” is held). For the sub-
data slice line, the count value is stored in bits 3 to 7 of clock run-in
detect register 3 (address 0208
16
). Read out these bits after the
occurence of a data slicer interrupt (refer to (11) Interrupt Request
Generating Circuit).
Figure 48 shows the structure of clock run-in detect registers 1 and
3.
Fig. 44. Clock Run-in Register 1
b7 b6 b5 b4 b3 b2 b1 b0
Clock run-in register 1 (CR1) [Address 00E6
16
]
Clock Run-in Register 1
0
to
3
0
R W
Clock run-in count value
of main-data slice line
(CR10 to CR13)
0
R W
4, 6
Fix these bits to “1.”
B
After reset
Functions
Name
R W
1
0
1
0
R W
5, 7
Fix these bits to “0.”
0
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