NJU6657 Datasheet, PDF (57/78 Pages) New Japan Radio – 88-common x 272-segment Bitmap LCD Driver

In External clock operation, the external clock input to OSC1 terminal.
The formula is shown below.
Condition: DUM=’0’
External clock frequency f_OSC = nÊ·f_FRÊ· (CL Ê·6)
n: Divide count
f_FR: Frame frequency
CL: Display line
Condition: External clock Input, DUM=”1”
External Clock Frequency f_OSC = nÊ·f_FRÊ· { (CL+1dummy) Ê·6 }
n: Divide count
f_FR: Frame frequency
CL: Display line
The relationship between OSC register (OS4 to OS0) and OSC frequency are shownbelow.
NJU6657
Preliminary
200
180
160
140
120
100
80
60
40
20
0
OS4 to OS0
Ver.2012-11-22
- 57 -