Rev. 6.00, 08/04, page 410 of 628
Bit 4—Display Data Control (DISP)
Bit 4 specifies whether the LCD RAM contents are displayed or blank data is displayed regardless
of the LCD RAM contents.
Bit 4
DISP
Description
0
Blank data is displayed
(initial value)
1
LCD RAM data is display
Bits 3 to 0—Frame Frequency Select 3 to 0 (CKS3 to CKS0)
Bits 3 to 0 select the operating clock and the frame frequency. In subactive mode, watch mode,
and subsleep mode, the system clock (
φ
) is halted, and therefore display operations are not
performed if one of the clocks from
φ
/2 to
φ
/256 is selected. If LCD display is required in these
modes,
φ
w,
φ
w/2, or
φ
w/4 must be selected as the operating clock.
Frame Frequency
*
2
Bit 3
CKS3
Bit 2
CKS2
Bit 1
CKS1
Bit 0
CKS0
Operating Clock
φφφφ
= 2 MHz
φφφφ
= 250 kHz
*
1
0
*
0
0
φ
w
128 Hz
*
3
(initial value)
0
*
0
1
φ
w/2
64 Hz
*
3
0
*
1
*
φ
w/4
32 Hz
*
3
1
0
0
0
φ
/2
—
244 Hz
1
0
0
1
φ
/4
977 Hz
122 Hz
1
0
1
0
φ
/8
488 Hz
61 Hz
1
0
1
1
φ
/16
244 Hz
30.5 Hz
1
1
0
0
φ
/32
122 Hz
—
1
1
0
1
φ
/64
61 Hz
—
1
1
1
0
φ
/128
30.5 Hz
—
1
1
1
1
φ
/256
—
—
*
: Don’t care
Notes: 1. This is the frame frequency in active (medium-speed,
φ
osc/16) mode when
φ
= 2 MHz.
2. When 1/3 duty is selected, the frame frequency is 4/3 times the value shown.
3. This is the frame frequency when
φ
w = 32.768 kHz.
Содержание H8/38024 Series
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