HD66765 Datasheet, PDF (20/71 Pages) Hitachi Semiconductor – 396-channel Segment Driver with Internal RAM for 4096-color Displays

HD66765
Entry Mode (R05h)
Compare Register (R06h)
R/W RS
W1
DB15 DB14 DB13 DB12 DB11 DB10 DB9 DB8 DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0 0 0 0 0 0 HWM 0 0 0 I/D1 I/D0 AM LG2 LG1 LG0
W1
0 0 0 0 CP11 CP10 CP9 CP8 CP7 CP6 CP5 CP4 CP3 CP2 CP1 CP0
n ^{Figure 8 Entry Mode and Compare Register Instruction}
tio ^{The write data sent from the microcomputer is modified in the HD66765 and written to the GRAM. The}
display data in the GRAM can be quickly rewritten to reduce the load of the microcomputer software
a _{processing. For details, see the Graphics Operation Function section.}
ific ^{HWM: When HWM=1, data can be written to the GRAM at high speed. In high-speed write mode, four}
c ^{words of data are written to the GRAM in a single operation after writing to RAM four times. Write to}
e RAM four times, otherwise the four words cannot be written to the GRAM. Thus, set the lower 2 bits to 0
p ^{when setting the RAM address. For details, see High-Speed RAM Write Mode section.}
S _{I/D1-0: When I/D1-0 = 1, the address counter (AC) is automatically incremented by 1 after the data is}
y _{written to the GRAM. When I/D1-0 = 0, the AC is automatically decremented by 1 after the data is}
r _{written to the GRAM. The increment/decrement setting of the address counter by I/D1-0 is done}
a _{independently for the upper (AD15-8) and lower (AD7-0) addresses. The direction of moving through the}
in addresses when the GRAM is written to is set by the AM bit.
lim ^{AM: Set the automatic update method of the AC after the data is written to the GRAM. When AM = 0,}
the data is continuously written in parallel. When AM = 1, the data is continuously written vertically.
e _{When window address range is specified, the GRAM in the window address range can be written to}
Pr ^{according to the I/D1-0 and AM settings.}
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