Renesas H8/38024 Hardware Manual page 440

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
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, φw, φw/2, or φw/4 must be selected as the operating clock.
Bit 3 Bit 2 Bit 1
CKS3 CKS2 CKS1
0 0
*
0 * 0
0 1
*
1 0 0
1 0 0
1 0 1
1 0 1
1 1 0
1 1 0
1 1 1
1 1 1
Notes: 1. This is the frame frequency in active (medium-speed, φosc/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 φw = 32.768 kHz.
Rev. 6.00, 08/04, page 410 of 628
Bit 0
CKS0 Operating Clock
φw
0
φw/2
1
φw/4
*
φ/2
0
φ/4
1
φ/8
0
φ/16
1
φ/32
0
φ/64
1
φ/128
0
φ/256
1
Frame Frequency *
φ φ φ φ = 2 MHz φ φ φ φ = 250 kHz *
3
128 Hz *
(initial value)
3
64 Hz *
3
32 Hz *
— 244 Hz
977 Hz 122 Hz
488 Hz 61 Hz
244 Hz 30.5 Hz
122 Hz —
61 Hz —
30.5 Hz —
— —
(initial value)
2
1
*: Don't care