ST7586S Sitronix Technology Corporation, ST7586S Datasheet - Page 20

• Manufacturer Part Number: ST7586S
• Description: 4-level Gray Scale Dot Matrix Lcd Controller/driver
• Manufacturer: Sitronix Technology Corporation

ST7586S
Addressing
In order to allow MCU accessing display data continuously, the address counter is automatically increasing by one (+1) after
accessing each byte of display data (i.e. “White Display Data” in all interface or “Read Display Data” in parallel interface). The
locations of RAM are addressed by the address pointers (XS, XE, YS and YE). The address ranges are X=0~127 (column
address) and Y=0~159 (row address). Addresses outside these range is not allowed.
Before writing to DDRAM, a “window” must be defined for the incoming display data. By specifying the address pointers XS,
XE, YS and YE, a “window” is established. The instruction registers XS and YS identify the start addresses while XE and YE
identifying the end addresses. For example, the whole display range will be written via the following values to define 384x160:
XS=0 (00h), YS=0 (00h) and XE=127 (7Fh), YE=159 (9Fh).
Column Address Circuit
The column address of DDRAM is specified by the “Set Column Address” instruction. Each column address includes three
sub-columns Column N, Column N+1 and Column N+2 respectively (“N” is the column address value). The column address
counter is increased by one (+1) after each byte of display data accessed (write/read). The starting column address is
defined by XS and the ending column address is defined by XE. The column address counter will be returned to the starting
column address (XS) immediately if the increment of the column address exceeds the boundary column address (XE).
Row Address Circuit
The circuit provides the row address of DDRAM. The row address is increased by one (+1) after the column address counter
is over XE. The row address will be returned to starting row address (YS) immediately when the row address is increased by
one over the ending row address (YE).
Ver-1.1b
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2009/12/23