ra8835a RAIO Technology Inc., ra8835a Datasheet - Page 33

• Manufacturer Part Number: ra8835a
• Description: Dot Matrix Lcd Controller
• Manufacturer: RAIO Technology Inc.

RAiO TECHNOLOGY INC.
Version 1.0
6-5 Memory Control Commands
6-5-1 MWRITE
6-5-2 MREAD
The microprocessor may write a sequence of data bytes to display memory by issuing the MREAD
command and then writing the bytes to the RA8835A series. There is no need for further MWRITE
commands or for the microprocessor to update the cursor address register after each byte as the
cursor address is automatically incremented by the amount set with CSRDIR, in preparation for the
next data write.
Note: P1, P2, ..., Pn: display data.
Put the RA8835A series into the data output state. Each time the microprocessor reads the buffer,
the cursor address is incremented by the amount set by CSRDIR and the next data byte fetched
from memory, so a sequence of data bytes may be read without further MREAD commands or by
updating the cursor address register. If the cursor is displayed, the read data will be from two
positions ahead of the cursor.
P1
P2
Pn
C
Pn
P1
P2
C
MSB
MSB
0
0
Figure 6-24: MWRITE Parameters
Figure 6-25: MREAD Parameters
1
1
0
0
33/88
0
0
0
0
0
0
1
1
0
1
LSB
LSB
N>1
N>1
Dot Matrix LCD Controller
RA8835A
www.raio.com.tw