M37274EFSP datasheet(76/148 Pages) RENESAS

76 / 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

Input

Port

(4) Clock for OSD

As a clock for display to be used for OSD, it is possible to select one

of the following 4 types.

•Main clock (8 MHz)

• Data slicer clock output from the data slicer (approximately 26 MHz)

• Clock from the LC oscillator supplied from the pins OSC1 and OSC2

• Clock from the ceramic resonator or the quartz-crystal oscillator

from the pins OSC1 and OSC2

This OSD clock for each block can be selected by the following bits

: bit 7 of the port P3 direction register, bits 5 and 4 of the clock source

control register (addresses 021616). A variety of character sizes can

be obtained by combining dot sizes with OSD clocks. When not us-

ing the pins OSC1 and OSC2 for the OSD clock I/O pins, the pins

can be used as sub-clock I/O pins or port P6.

Fig. 76. Block Diagram of OSD Selection Circuit

Table 12. Setting for P63/OSC1/XCIN, P64/OSC2/XCOUT

b7 of port P3 direction

Clock source

control register

OSD Clock

I/O Pin

Sub-clock

I/O Pin

Function

“0”

“11”

“10”

“0”

32 kHZ

Data slicer

circuit

Data slicer clock

OSC1 clock

Ceramic •

quartz-crystal

Oscillating mode for OSD

CS5, CS4

“00”

“1”

CS0

CS1

CS3

CS2 = “0”

CC mode block

OSD mode block

EXOSD mode block

Except “10”

“10”

CS2, CS1

Except “10”

Clock oscillation

circuit

Main clock

Except “10”

CS2, CS1

(Note)

Note : To use data slicer clock, set bit 0 of data slicer control register to “1.”

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