h8s-2646 Renesas Electronics Corporation., h8s-2646 Datasheet - Page 678

• Manufacturer Part Number: h8s-2646
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 18 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.
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/8 to φ/1024 is selected. If LCD display is required in these modes, φ
selected as the operating clock.
Notes: 1. When 1/3 duty is selected, the frame frequency is 4/3 times the value shown.
Rev. 5.00 Sep 22, 2005 page 652 of 1136
REJ09B0257-0500
Bit 4
DISP
0
1
Bit 3
CKS3
0
1
2. This is the frame frequency when φ
Bit 2
CKS2
*
0
1
Description
Blank data is displayed
LCD RAM data is display
Bit 1
CKS1
0
1
0
1
0
1
Bit 0
CKS0
0
1
*
0
1
0
1
0
1
0
1
Operating Clock
φ
φ
φ
φ/8
φ/16
φ/32
φ/64
φ/128
φ/256
φ/512
φ/1024
SUB
SUB
SUB
/2
/4
SUB
= 32.768 kHz.
Frame Frequency *
φ φ φ φ = 20 MHz
128 Hz *
64 Hz *
32 Hz *
4880 Hz
2440 Hz
1220 Hz
610 Hz
305 Hz
152.6 Hz
76.3 Hz
38.1 Hz
SUB
, φ
2
2
2
SUB
/2, or φ
SUB
(Initial value)
(Initial value)
1
*: Don’t care
/4 must be