ST7531 datasheet(45/85 Pages) SITRONIX

45 / 85 page

ST7531

Ver 1.8

45/85

2006/9/18

PB4: It is used to specify the scrolling mode.

Settings

SCM1 SCM0 Scrolling Mode

Top block address (TB) Bottom block address (BB)

Number of specified blocks

(NSB)

Center mode

Top(fixed area) height

= Top address

Bottom(fixed area) height

= 39-Bottom address

Bottom start address

= Specified number

Top mode

Bottom(fixed area) height

= 39-Bottom address

Bottom start address

= Specified number

Bottom mode

Top(fixed area) height

= Top address

Whole mode

Since ST7531 processes the liquid crystal display

signals on the four-line basis (block basis), fixed and

scrolled areas are also specified on the four-line basis

(block basis).

DDRAM address of the top fixed area is set in the block

address increasing direction starting with the 0

th block.

DDRAM address of the bottom fixed area is set in the

block address decreasing direction starting with 39

block. The DDRAM address of other blocks fixed areas

are assigned to the scrolled + background areas.

PB1 is to specify the top block address of the scrolled +

background areas. Specify the 0

th block for the top screen scroll or whole screen scroll.

PB2 specifies the bottom address of the scroll + background areas. Specify the 39

th block for the bottom or whole screen

scroll. The relation that top block address < bottom block address must be maintained.

PB3 specifies a specific number of blocks {Numbers of (Top fixed area +Scroll area) block-1}. In the case of the bottom

scroll or whole screen scroll, the value is identical with PB2.

The user can turn on the area scroll function by executing the area scroll set command first and then specifying the display

start block of the scroll area with the scroll start set command.

(16) Scroll start address set (SCSTART) - Parameter Byte: 1 (ABH)

This command is to specify which line address of DDRAM to be the start line content shown on screen. Note that you must

execute this command after executing the area scroll set command. Scroll becomes available by dynamically changing the

start block address.

Function

Command

Parameter Byte 1 (PB1)

SB5

SB4

SB3

SB2

SB1

SB0 Start block address

Note : Don’t repeat “Area scroll set(AAH)” instruction when “Scroll start address set” is executed.

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