hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 464

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 13 LCD Controller/Driver
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
0
1
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
CKS3
0
0
0
1
1
1
1
1
1
1
1
Notes: 1. This is the frame frequency in active (medium-speed, φosc/16) mode when φ = 2 MHz.
Rev. 7.00 Mar 10, 2005 page 422 of 652
REJ09B0042-0700
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.
Bit 2
CKS2
*
*
*
0
0
0
0
1
1
1
1
Description
Blank data is displayed
LCD RAM data is display
Bit 1
CKS1
0
0
1
0
0
1
1
0
0
1
1
Bit 0
CKS0
0
1
*
0
1
0
1
0
1
0
1
Operating Clock
φw
φw/2
φw/4
φ/2
φ/4
φ/8
φ/16
φ/32
φ/64
φ/128
φ/256
φ φ φ φ = 2 MHz
128 Hz *
64 Hz *
32 Hz *
—
977 Hz
488 Hz
244 Hz
122 Hz
61 Hz
30.5 Hz
—
3
3
3
Frame Frequency *
(initial value)
φ φ φ φ = 250 kHz *
244 Hz
122 Hz
61 Hz
30.5 Hz
—
—
—
—
(initial value)
*: Don’t care
2
1