ST7588T Datasheet, PDF (26/61 Pages) Sitronix Technology Co., Ltd. – 81 x 132 Dot Matrix LCD Controller/Driver

ST7588T
Data Transfer
The ST7588T uses bus holder and internal data bus for data transfer with the MPU. When writing data from the MPU to
on-chip RAM, data is automatically transferred from the bus holder to the RAM as shown in Figure 12. Moreover, when
reading data from on-chip RAM to the MPU, the data for the initial read cycle is stored in the bus holder (dummy read) and
the MPU reads this stored data from bus holder for the next data read cycle as shown in Figure 13. This means that a dummy
read cycle must be inserted between each pair of address sets when a sequence of address sets is executed. Therefore, the
data of the specified address cannot be output with the read display data instruction right after the address sets, but can be
output at the second read of data.
MPU signal
A0
/WR
D0 to D7
N
D(N) D(N+1) D(N+2) D(N+3)
Internal signals
/WR
BUS HOLDER
N
COLUMN ADDRESS
D(N) D(N+1) D(N+2) D(N+3)
N
N+1 N+2 N+3
Figure 12 Write Timing
MPU signal
A0
/WR
/RD
D0 to D7
N
Dummy D(N) D(N+1)
Internal signals
/WR
/RD
BUS HOLDER
N
D(N) D(N+1) D(N+2)
COLUMN ADDRESS
N
D(N) D(N+1) D(N+2)
Figure 13 Read Timing
Ver 1.3
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2007/09/20