M37274EFSP datasheet(46/148 Pages) RENESAS

46 / 148 page

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

4 ! set value of the start bit position

Time from the falling of the horizontal

synchronizing signal to the last rising

of the clock run-in

Fig. 40. Start Bit Position Register

Time from the faling of the horizontal

synchronous signal to occurrence of

the start bit

(7) Start Bit Detecting Circuit

This circuit detects a start bit at line decided in the data slice line

specification circuit. For start bit detection, it is possible to select one

of the following two types by using bit 1 of clock run-in register 2

(address 00E716).

After the lapse of the time corresponding to the set value of the

start bit position register (address 00E116), the first rising of the

composite video signal is detected as a start bit.

The time is set in bits 0 to 6 of the start bit position register (address

00E116) (refer to Figure 40). Set a value fit for the following

conditions.

Figure 40 shows the structure of the start bit position register.

b7 b6 b5 b4 b3 b2 b1 b0

Start bit position register (SP) [Address 00E116]

Start Bit Position Register

0R W

Start bit generating time

(SP0 to SP6)

DSC1 bit 7 control bit

(SP7)

After reset

Functions

Name

0 : Generation of 16 pulses

1 : Generation of 16 pulses and

detection of clock run-in

pulse (4 to 6 pulses)

Time from a falling of the horizontal

synchronous signal to occurrence

of a start bit =

4 ! set value (“0016” to “7F16”) !

reference clock period

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