h8s-2649 Renesas Electronics Corporation., h8s-2649 Datasheet - Page 554

• Manufacturer Part Number: h8s-2649
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 17 LCD Controller/Driver
Table 17.4 Frame Frequency Selection
[Legend]
X:
Notes: 1. When 1/3 duty is selected, the frame frequency is 4/3 times the value shown.
Rev. 2.00 Dec. 05, 2005 Page 516 of 724
REJ09B0200-0200
Bit
3
2
1
0
Bit 3
CKS3
0
1
Don't care
2. This is the frame frequency when φ
Bit Name
CKS3
CKS2
CKS1
CKS0
Bit 2
CKS2
X
0
1
Initial
Value
0
0
0
0
Bit 1
CKS1
0
1
0
1
0
1
R/W
R/W
R/W
R/W
R/W
Bit 0
CKS0
0
1
X
0
1
0
1
0
1
0
1
Description
Frame Frequency Select 3 to 0
These bits 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
the operating clock.
For details, see table 17.4.
SUB
Operating Clock
φ
φ
φ
φ/8
φ/16
φ/32
φ/64
φ/128
φ/256
φ/512
φ/1024
= 32.767 MHz.
SUB
SUB
SUB
/2
/4
SUB
, φ
SUB
/2, or φ
SUB
/4 must be selected as
Frame Frequency*
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
2
2
2
1