SH7721 datasheet(975/1524 Pages) RENESAS

975 / 1524 page

Section 26

LCD Controller (LCDC)

Rev. 3.00 Jan. 18, 2008 Page 913 of 1458

REJ09B0033-0300

Table 26.5

Available Power-Supply Control-Sequence Periods at Typical Frame Rates

Frame Rate

ONX, OFFX Register

Value

120 Hz

60 Hz

H'F

(

−1+1)/120 = 0.00 (ms)

(

−1+1)/60 = 0.00 (ms)

H'0

(0+1)/120 = 8.33 (ms)

(0+1)/60 = 16.67 (ms)

H'1

(1+1)/120 = 16.67 (ms)

(1+1)/60 = 33.33 (ms)

H'2

(2+1)/120 = 25.00 (ms)

(2+1)/60 = 50.00 (ms)

H'3

(3+1)/120 = 33.33 (ms)

(3+1)/60 = 66.67 (ms)

H'4

(4+1)/120 = 41.67 (ms)

(4+1)/60 = 83.33 (ms)

H'5

(5+1)/120 = 50.00 (ms)

(5+1)/60 = 100.00 (ms)

H'6

(6+1)/120 = 58.33 (ms)

(6+1)/60 = 116.67 (ms)

H'7

(7+1)/120 = 66.67 (ms)

(7+1)/60 = 133.33 (ms)

H'8

(8+1)/120 = 75.00 (ms)

(8+1)/60 = 150.00 (ms)

H'9

(9+1)/120 = 83.33 (ms)

(9+1)/60 = 166.67 (ms)

H'A

(10+1)/120 = 91.67 (ms)

(10+1)/60 = 183.33 (ms)

H'B

(11+1)/120 = 100.00 (ms)

(11+1)/60 = 200.00 (ms)

H'C

(12+1)/120 = 108.33 (ms)

(12+1)/60 = 216.67 (ms)

H'D

(13+1)/120 = 116.67 (ms)

(13+1)/60 = 233.33 (ms)

H'E

(14+1)/120 = 125.00 (ms)

(14+1)/60 = 250.00 (ms)

ONA, ONB, ONC, OFFD, OFFE, and OFFF are used to set the power-supply control-sequence

periods, in units of frames, from 0 to 15. 1 is subtracted from each register. H'0 to H'E settings

select from 1 to15 frames. The setting H'F selects 0 frames.

Actual sequence periods depend on the register values and the frame frequency of the display. The

following table gives power-supply control-sequence periods for display frame frequencies used

by typical LCD modules.

• When ONB is set to H'6 and display's frame frequency is 120 Hz

The display's frame frequency is 120 Hz. 1 frame period is thus 8.33 (ms) = 1/120 (sec).

The power-supply input sequence period is 7 frames because ONB setting is subtracted by 1.

As a result, the sequence period is 58.33 (ms) = 8.33 (ms)

× 7.

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