RA8816
Preliminary Version 1.6
6-1-4 Memory Read/Write
144x65 Character/Graphic LCD Driver
Another cycle for MPU to RA8816 is memory Read/Write cycle. Normally it used to show
information on the LCD screen. A memory writing means to write a data into the mapping address
that cursor located in the memory. After a memory writing is completed, the cursor will auto increase.
And the data of next memory write will fill into the new memory address that new curser position
located. Because all of the memory read/write cycles are transfer the display data, so we can
abbreviate the name of Memory Access Cycle to Data Cycle.
The Figure 6-15 and 6-16 show the memory access timing of 8080 MPU(8-Bit) with RA8816. Figure
6-17 and 6-18 show the memory access timing of 6800MPU(8-Bit) interface. Figure 6-19 to 6-22
show the memory access timing of serial interface.
DB[7:0]
CS
DATA(n+1)
DATA(n)
DB[7:0]
CS
DATA(n)
DATA(n+1)
WR
WR
RD
RD
D/C
D/C
Figure 6-15: Memory Write on 8080(8-Bit) I/F
Figure 6-16: Memory Read on 8080(8-Bit) I/F
DB[7:0]
CS
DB[7:0]
CS
DATA(n)
DATA(n+1)
DATA(n)
DATA(n+1)
R/W
EN
R/W
EN
RS
RS
Figure 6-17: Memory Write on 6800(8-Bit) I/F
Figure 6-18: Memory Read on 6800(8-Bit) I/F
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