m35047 Renesas Electronics Corporation., m35047 Datasheet - Page 21

• Manufacturer Part Number: m35047
• Description: Screen Character And Pattern Display Controllers
• Manufacturer: Renesas Electronics Corporation.

REGISTER SUPPLEMENTARY DESCRIPTION
(1) Setting external clock input and display frequency mode
Fig. 12 Example of external clock input
20
Setting external clock input and display frequency mode (by
use of EXCK0, EXCK1 (121
explained here following.
(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 100 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 expres-
sion.
Display frequency =Horizontal synchronous frequency
Horizontal synchronous signal
Multiply value
16
) and DIV10 to DIV0 (120
External clock
16
). Also, set the
16
), as
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 100 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 =
n = 0
frequency
10
2
n
DIV
MITSUBISHI MICROCOMPUTERS
n
M35047-XXXSP/FP
16
) for make the