MSM6255 데이터 시트보기 (PDF) - Oki Electric Industry

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MSM6255

DOT MATRIX LCD CONTROLLER

Oki Electric Industry 

¡ Semiconductor

MSM6255

– Relation Between Duty and Number of Lines

Number of lines is determined by Vr, number of lines in vertical direction(display duty).

Number of lines = Vr x 2

Note: In the character display mode, number of lines should not be odd number.

– Calculation of Crystal Oscillation Frequency (fosc)

Table 3 Calculation Formula of fosc

DIV

Output mode

q

L

w

q

H

w

Calculation formula of fosc

FRP x (HN + 8) x Hp x Vr x 2

FRP x (HN + 8) x Vr x 4

FRP x (HN + 8) x Hp x Vr

FRP x (HN + 8) x Vr x 2

Calculation exmaple (MHz)

9.856

2.464

4.928

1.232

Note:

(1) Table 3 shows a calculation example assuming that FRP = 70 Hz, HN = 80, Hp = 8 and

Vr = 100. However, the example of Hp = 4 to 7 in 4-bit parallel is not included.

(2) Output mode q : Hp = 4 to 7 in 1-bit serial, 2-bit parallel and 4-bit parallel

Output mode w : Hp = 8 in 4-bit parallel

– Calculation of Character Clock (CHf) Frequency

CHφ = FRP x (HN + 8) x Vr

Example: Assuming FRP = 70 Hz, HN = 80 and Vr= 100, CHf = 1.62 (ms)

– Calculation of Shift Clock (CLP) Frequency

Table 4 Calculation Formula of CLP

Output mode

1-bit serial

2-bit parallel

4-bit parallel

Calculation formula of CLP

RP x (HN + 8) x Hp x Vr

FRP x (HN + 8) x Hp x Vr x 1/2

FRP x (HN + 8) x Hp x Vr x 1/4

Calculation exmaple (MHz)

4.928

2.464

1.232

Note: Table 4 shows a calculation example assuming that FRP = 70 Hz, HN = 80, Hp = 8 and

Vr= 100.

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