hd66765 Renesas Electronics Corporation., hd66765 Datasheet - Page 25

• Manufacturer Part Number: hd66765
• Description: 396-channel Segment Driver With Internal Ram For 4096-color Displays - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

Frame Cycle Control (R0Bh)
RTN3-0: Set the line retrace period (RTN3-0) to be added to raster-row cycles. The raster-row cycle
becomes longer according to the number of clocks set at RTN3-0.
DIV1-0: Set the division ratio of clocks for internal operation (DIV1-0). Internal operations are driven by
clocks which are frequency divided according to the DIV1-0 setting. Frame frequency can be adjusted
along with the line retrace period (RTN3-0). When changing the drive-duty cycle, adjust the frame
frequency. For details, see the Frame Frequency Adjustment Function section.
Table 10 RTN Bits and Clock Cycles
RTN3
Table 11 DIV Bits and Clock Frequency
DIV1
R/W
W
0
0
0
0
1
1
0
0
1
1
:
RS
1
RTN2
DIV0
0
0
0
0
1
1
0
1
0
1
:
DB15
0
RTN1
Division Ratio
0
0
1
1
1
1
:
DB14
0
* fosc = R-C oscillation frequency
1
2
4
8
DB13
RTN0
0
0
1
0
1
0
1
:
Figure 14 Frame Cycle Control Instruction
DB12
0
Line Retrace Period
(Clock Cycles)
Internal Operation
Clock Frequency
DB11
0
fosc / 1
fosc / 2
fosc / 4
fosc / 8
DB10
0
14
15
0
1
2
3
:
DIV1
DB9
25
DIV0
DB8
DB7
Clock
Cycles per
Raster-row
0
DB6
25
26
27
28
39
40
:
0
DB5
0
DB4
0
RTN3
DB3
RTN2
DB2
HD66765
RTN1
DB1
RTN0
DB0