M37207MF datasheet(72/122 Pages) RENESAS

72 / 122 page

MITSUBISHI MICROCOMPUTERS

M37207MF-XXXSP/FP, M37207M8-XXXSP

M37207EFSP/FP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER

and ON-SCREEN DISPLAY CONTROLLER

Fig. 68. CRT Clock Selection Register

(13) Clock for Display

As a clock for display to be used for CRT display, it is possible to

select one of the following 3 types.

•Main clock supplied from the XIN pin

•Clock from the LC or RC supplied from the pins OSC1 and OSC2.

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

plied from the pins OSC1 and OSC2.

This clock for display can be selected for each block by the CRT

clock selection register (address 020916).

When selecting the main clock, set the oscillation frequency to

8 MHz.

b7 b6 b5 b4 b3 b2 b1 b0

CRT clock selection register (OP) [Address 020916]

Name

Functions

After reset R W

CRT Clock Selection Register

0, 1 CRT clock

selection bits

(OP0, OP1)

Since the main clock is used as the clock for

display, the oscillation frequency is limited.

Because of this, the character size in width

(horizontal) direction is also limited. In this

case, pins OSC1 and OSC2 are also used

as input ports P70 and P71 respectively.

The clock for display is supplied by connecting the

following across the pins OSC1 and OSC2.

• a ceramic resonator only for CRT display and a feedback resistor

• a quartz-crystal oscillator only for CRT display and a feedback

resistor (See note)

The clock for display is supplied by connecting RC

or LC across the pins OSC1 and OSC2.

Functions

CRT oscillation

frequency

= f(XIN)

Notes 1: It is necessary to connect other ceramic resonator or quartz-crystal oscillator across the pins XIN and XOUT.

2: CC6 is the scnanning line double count mode flag.

R—

CC6

CC6 =

“0” or “1”

CC6 = “0”

—

Do not set.

Fix this bits to “0.”

Nothing is assigned. These bits are write disable bits.

When these bits are read out, the values are “0.”

M37207MF Datasheet(PDF) 72 Page - Renesas Technology Corp

M37207MF Datasheet(HTML) 72 Page - Renesas Technology Corp

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL