MITSUBISHI MICROCOMPUTERS
M37274EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
Clock Run-in Register 3
b7 b6 b5 b4 b3 b2 b1 b0
Clock run-in register 3 (CR3) [Address 020916
]
B
Name
Functions
After reset
0
R
R
W
W
0
to
3
Clock run-in count value of
sub-data slice line (CR30
to CR33)
0: Data is not latched yet Indeterminate
1: Data is latched
R
4
Data latch completion flag
for caption data in sub-
data slice line (CR34)
W
W
W
5
6
0: Main data slice line
1: Sub- data slice line
Indeterminate
R
R
Data slice line selection bit
for interrupt request
(CR35)
Interrupt mode selection bit
(CR36)
0: Interrupt occurs at end Indeterminate
of data slice line
1: Interrupt occurs at
completion of caption
data latch
7
Indeterminate
R
—
Nothing is assigned. This bit is a write disable bit.
When this bit is read out, the value is “0.”
Fig. 45. Clock Run-in Register 3
Horizontal
synchronous
signal
Start bit data +
16-bit data
Clock run-in
Composite
video signal
Window
✽When the count value
in the window is 4 to 6,
this is determined as a
clock run-in.
Time to be set in the
window register
Time to be set in
the start bit position
register
Fig. 46. Window Setting
Clock Run-in Detect Register i
b7 b6 b5 b4 b3 b2 b1 b0
Clock run-in detect register i (CRDi) (i=1, 3) [Addresses 00E816, 020816
]
R
R
W
W
B
Name
Test bits
Functions
Read-only
After reset
0
0
to
2
3
to
7
0
R
—
Clock run-in detection bits
(CRDi3 to CRDi7)
Number of reference clock s
to be counted one clock run-
in pulse period
Fig. 47. Clock Run-in Detect Registers 1 and 3
49
RENESAS [ RENESAS TECHNOLOGY CORP ]
