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参数资料
| 型号： | M37274MA-XXXSP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, MICROCONTROLLER, PDIP52 |
| 封装： | 0.600 INCH, 1.778 MM PITCH, SHRINK, PLASTIC, DIP-52 |
| 文件页数： | 67/131页 |
| 文件大小： | 2049K |
| 代理商： | M37274MA-XXXSP |
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40
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37274MA-XXXSP
PRELIMINARY
Notice:
This
is not
a final
specification.
Some
paramentic
limits
are
subject
to change.
MITSUBISHI MICROCOMPUTERS
Fig. 36. Clock Run-in Register 1
Fig. 39. Clock Run-in Detect Registers 1 and 3
Fig. 38. Window Setting
Fig. 37. Clock Run-in Register 3
For the main data slice line, the count value of pulses in the window
is stored in clock run-in register 1 (address 00E616; refer to Figure
36). For the sub-data slice line, the count value of pulses in the window
is stored in clock run-in register 3 (address 020916; refer to Figure
37). 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 38).
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 00E916) to the next falling. The count value
is stored in bits 3 to 7 of clock run-in detect register 1 (address
00E816) (When the count value exceeds “1F16,” “1F16” 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 020816). Read out these bits
after the occurence of a data slicer interrupt (refer to (11) Interrupt
Request Generating Circuit).
Figure 39 shows the structure of clock run-in detect registers 1 and
3.
70
Clock run-in count value of
main-data slice line
Clock run-in register 1
(CR1 : address 00E6 16)
Fix these bits to “0101 2”
010 1
7
Clock run-in count value of sub-data
slice line
Clock run-in register 3
(CR3 : address 0209 16)
Data latch completion flag for caption data in
i
sub-data slice line
0: Data is not latched yet
1: Data is latched
Data slice line selection bit for interrupt
request
0: Main data slice line
1: Sub-data slice line
Interrupt mode selection bit
0: Interrupt occurs at end of data slice line
a
1: Interrupt occurs at completion of caption
data latch
VWhen the count value
in the window is 4 to 6,
this is determined as a
clock run-in.
Horizontal
synchronous
signal
Composite
video signal
Window
Clock run-in
Start bit data +
16-bit data
Time to be set in the
window register
Time to be set in
the start bit position
register
70
Number of reference clocks to
be counted in one clock run-in
pulse period
Clock run-in detect registers 1, 3
( CRD1 : address 00E8 16)
( CRD3 : address 0208 16)
Test bits : read-only
0
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