m35071-067sp Mitsumi Electronics, Corp., m35071-067sp Datasheet - Page 17

• Manufacturer Part Number: m35071-067sp
• Description: Screen Character Pattern Display Controllers
• Manufacturer: Mitsumi Electronics, Corp.

REGISTER SUPPLEMENTARY DESCRIPTION
(1) Setting external clock input and display frequency mode
Fig. 4 Example of external clock input
Setting external clock input and display frequency mode (by
use of EXCK0 (120
(120
(a) When (EXCK1, EXCK0) = (0, 0) ......External synchronous
(b) When (EXCK1, EXCK0) = (0, 1) ......Internal
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.
synchronous… Fosc = 20 to 90 MHz
Clock input from the TCK pin is unnecessary. The multiply
clock of the internally generated horizontal synchronous
signal is used as the display clock.
The display frequency is set by setting the multiply value of
the horizontal synchronous frequency (of the display
frequency) in DIV10 to DIV0 (address 120
display frequency range. (See the next page.)
Display frequency is calculated using the below expression.
Display frequency = Horizontal synchronous frequency x
16
), as explained here following.
16
Horizontal synchronous signal
), EXCK1 (123
Multiply value
External clock
16
) and DIV10 to DIV0
16
). Also, set the
SCREEN CHARACTER and PATTERN DISPLAY CONTROLLERS
Number of clock (N1)
(c) When (EXCK1, EXCK0) = (1, 0) ......… Setting disabled
(d) When (EXCK1, EXCK0) = (1, 1) ......External synchronous 2
(Internal oscillation clock display) … Fosc = 20 to 90 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 120
display frequency is equal to the external clock frequency.
Also, set the display frequency range. (See the next page.)
1H
N1 = external clock frequency / horizontal synchronous
N1 =
frequency
n = 0
10
2
n
DIV
MITSUBISHI MICROCOMPUTERS
n
M35071-XXXSP/FP
16
) for make the
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