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M35072-059FP

SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

Mitsumi 

MITSUBISHI MICROCOMPUTERS

M35072-XXXFP

SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

REGISTER SUPPLEMENTARY DESCRIPTION

(1) Setting external clock input and display frequency mode

Setting external clock input and display frequency mode (by

use of EXCK0 (12016), EXCK1 (12316) and DIV10 to DIV0

(12016), as explained here following.

(a) When (EXCK1, EXCK0) = (0, 0) ......External synchronous

1 (External clock display) … Fosc = 20 to 70 MHz

Input from the TCK pin a constant-period continuous

external clock that synchronizes with the horizontal

synchronous signal. And input from HOR pin a constant

period continuous horizontal synchronous signal.

Never stop inputting the clock while displaying.

Do not have to set a display frequency because the clock

just as it is entered from outside is used as the display

clock.

(b) When (EXCK1, EXCK0) = Setting disabled

(c) When (EXCK1, EXCK0) = (1, 0) ......… Setting disabled

(d) When (EXCK1, EXCK0) = (1, 1) ......External synchronous 2

(Internal oscillation clock display) … Fosc = 20 to 80 MHz

Input from the TCK pin a constant-period continuous external

clock that synchronizes with the horizontal synchronous

signal. And input from HOR pin a constant-period continuous

horizontal synchronous signal.

Never stop inputting the clock while displaying.

An internal clock which is in sync with the external input clock

is used as the display clock.

Because the display frequency equals the external clock

frequency, set N1 (division value) that satisfies the below

expressions to DIV10 to DIV0 (address 12016) for make the

display frequency is equal to the external clock frequency.

N1 = external clock frequency / horizontal synchronous

frequency

10

N1 = Σ 2nDIVn

n=0

Also, set the display frequency range. (See the next page.)

Horizontal synchronous signal

External clock

Fig. 4 Example of external clock input

1H

Number of clock (N1)

17

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