Datasheet

SH1107
35
14. Set Display Clock Divide Ratio/Oscillator Frequency: (Double Bytes Command)
This command is used to set the frequency of the internal display clocks (DCLKs). It is defined as the divide ratio (Value
from 1 to 16) used to divide the oscillator frequency. POR is 1. Frame frequency is determined by divide ratio, number of
display clocks per row and oscillator frequency.
n Divide Ratio/Oscillator Frequency Mode Set: (D5H)
A0
RD
(E)
WR
(
WR/
)
D7 D6 D5 D4 D3 D2 D1 D0
0 1 0 1 1 0 1 0 1 0 1
n Divide Ratio/Oscillator Frequency Data Set: (00H - FFH)
A0
E
RD
WR /
WR
D7 D6 D5 D4 D3 D2 D1 D0
0 1 0 A7 A6 A5 A4 A3 A2 A1 A0
A3 - A0 defines the divide ration of the display clocks (DCLK). Divide Ration = A[3:0] +1.
A3 A2 A1 A0 Divide Ration
0 0 0 0 1 (POR)
: :
1 1 1 1 16
A7 - A4 sets the oscillator frequency. Oscillator frequency increases with the value of A[7:4] and vice versa.
A7 A6 A5 A4
Oscillator Frequency of
ƒOSC
0 0 0 0 -25%
0 0 0 1 -20%
0 0 1 0 -15%
0 0 1 1 -10%
0 1 0 0 -5%
0 1 0 1 ƒOSC (POR)
0 1 1 0 +5%
0 1 1 1 +10%
1 0 0 0 +15%
1 0 0 1 +20%
1 0 1 0 +25%
1 0 1 1 +30%
1 1 0 0 +35%
1 1 0 1 +40%
1 1 1 0 +45%
1 1 1 1 +50%