13. Dot Matrix LCD Controller (H8/3857 Group)
Rev.3.00 Jul. 19, 2007 page 336 of 532
REJ09B0397-0300
13.2.5
Frame Frequency Setting Register (LR3)
7
⎯
⎯
⎯
6
⎯
⎯
⎯
5
FS5
0
W
4
FS4
0
W
3
FS3
0
W
0
FS0
0
W
2
FS2
0
W
1
FS1
0
W
Bit
Initial value
Read/Write
LR3 is an 8-bit write-only register that sets the frame frequency.
Upon reset, LR3 is initialized to H'00.
Bits 7 and 6—Reserved Bits:
Bits 7 and 6 are reserved; they should always be cleared to 0.
Bits 5 to 0—Frame Frequency Setting (FS5 to FS0):
Bits 5 to 0 control the subclock division
ratio and set the LCD frame frequency. The relationship between the LCD frame frequency fF
(Hz), the subclock frequency fW (Hz), the division ratio r, and the LCD duty 1/N is as follows:
f
F
=
f
W
r
×
N
Set a division ratio suitable for the characteristics of the LCD panel used. The correspondence
between register settings and division ratios is shown in table 13.3.
Содержание F-ZTAT H8 Series
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