ST7528 Sitronix, ST7528 Datasheet - Page 21

• Manufacturer Part Number: ST7528
• Description: 16 Gray Scale Dot Matrix LCD Controller
• Manufacturer: Sitronix

ST7528
FUNCTIONAL DESCRIPTION
MICROPROCESSOR INTERFACE
Chip Select Input
There is CSB pin for chip selection. The ST7528 can interface with an MPU when CSB is "L". When these pins are set to
any other combination, A0, E_RD, and RW_WR inputs are disabled and DB0 to DB7 are to be high impedance. And, in
case of serial interface, the internal shift register and the counter are reset.
Parallel / Serial Interface
ST7528 has five types of interface with an MPU, which are three serial and two parallel interfaces. This parallel or serial
interface is determined by PS pin as shown in Table 1.
Parallel Interface (PS0 = "H")
The 8-bit bi-directional data bus is used in parallel interface and the type of MPU is selected by PS1 as shown in Table 2.
The type of data transfer is determined by signals at A0, E_RD and RW_WR as shown in Table 3.
PS1
H
L
NOTE: When E_RD pin is always pulled high for 6800-series interface, it can be used CSB for enable signal. In this case,
interface data is latched at the rising edge of CSB and the type of data transfer is determined by signals at A0, RW_WR as
in case of 6800-series mode.
Ver2.3
Common
Parallel
Serial
Type
A0
H
H
L
L
CSB
CSB
CSB
E_RD
(E)
H
H
H
H
PS2
6800-series
H
L
L
L
L
Table 2 Microprocessor Selection for Parallel Interface
RW_WR
(RW)
H
H
L
L
PS1
A0
A0
A0
H
H
L
L
L
Table 1 Parallel / Serial Interface Mode
Table 3 Parallel Data Transfer
E_RD
(/RD)
PS0
H
H
L
L
H
L
L
L
8080-series
E_RD
E
/RD
21/97
CSB
CSB
CSB
CSB
CSB
RW_WR
(/WR)
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H
H
L
L
RW_WR
RW
/WR
Writes to internal register (instruction)
6800-series MPU mode
8080-series MPU mode
Display data read out
3-Line SPI mode
4-Line SPI mode
Register status read
Interface mode
DB0 to DB7
DB0 to DB7
DB0 to DB7
Display data write
IIC SPI mode
Description
MPU bus
6800-series
8080-series
2007/1/3
Datasheet pdf - http://www.DataSheet4U.net/