ST7637 datasheet(31/210 Pages) SITRONIX

Part #	ST7637

Description	65K 132x132 Color Dot Matrix LCD Controller/Driver

PDF	210 Pages

Scroll/Zoom	100%

Manufacturer	SITRONIX [Sitronix Technology Co., Ltd.]

Direct Link	http://www.sitronix.com.tw

Logo

31 / 210 page

ST7637

Ver 1.6

31/210

2009/03

7.3

ACCESS TO DDRAM AND INTERNAL REGISTERS

ST7637 realizes high-speed data transfer because the access from MPU is a sort of pipeline processing done via the bus

holder attached to the internal, requiring the cycle time alone without needing the wait time.

For example, when MPU writes data to the DDRAM, the data is once held by the bus holder and then written to the

DDRAM before the succeeding write cycle is started. When MPU reads data from the DDRAM, the first read cycle is

dummy and the bus holder holds the data read in the dummy cycle, and then it read from the bus holder to the system bus

in the succeeding read cycle. Figure 7.3-1 illustrates these relations.

In 80-series interface mode:

Dummy

D (N )

D (N +1)

MPU signal

A 0

DATA

Internal signals

ADDRESS COUNTER

/RD

D (N )

D (N +1)

D (N +2)

D (N +3)

INTERNAL LATCH

Read

Operation

/WR

/RD

D (N )

D (N +1)

D (N +2)

Figure 7.3-1

ST7637 Datasheet(PDF) 31 Page - Sitronix Technology Co., Ltd.