M35046 Datasheet, PDF (14/40 Pages) Mitsubishi Electric Semiconductor – SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS

MITSUBISHI MICROCOMPUTERS
M35046-XXXSP/FP
SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS
REGISTER SUPPLEMENTARY DESCRIPTION
(1) Setting external clock input mode (by use of EXCK0 (12016) and
EXCK1 (12316))
Two modes given below are available for the external clock sig-
nal input. (the settings (EXCK1, EXCK0) = (0, 1), (1, 0) are forbid-
den.)
(a) When (EXCK1, EXCK0) = (0, 0), FOSC = 20 to 30 MHz
Input from the TCK pin a constant-period continuous external
clock that synchronizes with the horizontal synchronization 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) = (1, 1), FOSC = 20 to 80 MHz
Input from the TCK pin a constant-period continuous external
clock that synchronizes with the horizontal synchronization signal.
Never stop inputting the clock while displaying.
Be sure to set a display frequency because the internal clock
made to synchronize with the clock input from outside is used as
the display clock (see the next page).
(Example for input)
Horizontal synchronous signal
External clock
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